Did the EPA Just Legalize DEF Deletes? Kory Willis & Lawyer Explain
The Diesel Podcast
The Diesel Podcast Apr 20, 2026
Did the EPA Just Legalize DEF Deletes? Kory Willis & Lawyer Explain

Did the EPA Just Legalize DEF Deletes? Kory Willis & Lawyer Explain

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Did the EPA Just Legalize DEF Deletes? Kory Willis & Lawyer Explain
Term

DEF deletes

“DEF deletes” means bypassing or removing the system that uses a special fluid to clean diesel exhaust. It can reduce costs or change performance, but it can also make the truck illegal to operate on public roads depending on where you live.

Concept

emissions compliance (legal perspective)

They’re talking about whether changing emissions systems on trucks is allowed by law. The rules can vary, and the truck may still need to meet emissions testing requirements.

Term

trucks derating

Derating means the truck automatically makes less power. It usually happens when the emissions system senses a problem, and the truck limits performance to avoid damage or to stay within emissions limits.

Concept

EPA guidance

EPA guidance is the government’s official clarification about how a rule should be followed. Here, it’s about how certain emissions monitoring/sensor setups are treated under the rules.

Term

deaf sensors

“Deaf sensors” is a term people use when they try to stop the truck’s emissions system from reacting normally to what the sensors report. The EPA guidance mentioned here is about how sensors are handled and what’s allowed.

Term

Urea quality sensors (UQS)

These sensors check whether the DEF you’re using is “good enough” for the system to treat exhaust correctly. If the sensor can’t trust what it’s seeing, the truck may limit power so it can’t run in a way that would pollute more.

Term

SCR system

SCR is the part of a modern diesel that cleans up exhaust. It injects a special fluid (DEF) into the exhaust so the engine can meet emissions rules.

Term

derates the vehicle

A derate means the truck won’t make full power anymore. It’s like the computer putting the engine into a “limited” mode because something in the emissions system isn’t working right.

Term

NOx sensors

NOx sensors are sensors in the exhaust that detect harmful exhaust gases from diesel engines. They help the car figure out how much pollution is coming out so it can reduce it.

Concept

EPA issues guidance

EPA guidance is the agency’s explanation of how it plans to handle a regulation. It can signal what changes are coming, even before the final rules are written.

Concept

proposed rule

A proposed rule is the EPA’s “draft plan” for changing regulations. It usually comes before the final decision, after the agency lays out the reasoning and process.

Concept

formal rulemaking vs informal rulemaking

Rulemaking is how government agencies write new rules. The hosts are saying there are different legal “process types,” and the EPA can use them to change how requirements are enforced.

Concept

Clean Air Act

The Clean Air Act is a major U.S. law that sets rules for limiting air pollution. Here, the EPA is using that law to decide whether certain emissions requirements (like sensor mandates) should change.

Concept

EPA enforcement vs formal rulemaking

They’re explaining that EPA actions don’t always come as a brand-new law passed by Congress. Sometimes EPA issues guidance or rules, and enforcement can still depend on what the agency decides to treat as a violation.

Term

UQS sensors

UQS sensors are sensors that help the car/truck confirm its emissions system is working as intended. If someone deletes or changes them, it can make the vehicle fail emissions rules and may cause trouble.

Concept

diesel truck

They’re talking about diesel trucks that use an emissions system to keep exhaust cleaner. If you change or remove parts of that system, it can affect both legality and how the truck runs.

Company

SBA

SBA is mentioned as another group that was in the meeting with the EPA. The excerpt doesn’t clearly explain what SBA stands for here, but it’s being treated like a stakeholder in the discussion. The key point is that multiple agencies/groups were involved.

Term

ECU

The ECU is the truck’s main computer. It uses sensor readings to decide what to do—like how much to inject or how to control emissions. Here, they’re talking about the computer using a “best guess” model when certain sensor data isn’t available.

Company

Cummins

Cummins is a major diesel engine manufacturer, and the segment references how Cummins handled sensor supply issues during COVID. The context implies Cummins later implemented strategies to manage emissions controls when sensors were unavailable or unreliable. This is relevant because the episode is about how OEMs respond to DEF/NOx sensor-related compliance challenges.

Term

D-Rate system

A D-Rate system is an emissions-related derate strategy used by some diesel manufacturers to reduce engine power when emissions faults are detected. The segment suggests that if the D-Rate system isn’t in place, the vehicle might throw a code instead of managing the fault via derating. This is part of how manufacturers keep compliance while handling sensor or emissions-system issues.

Term

diesel exhaust fluid

DEF is a special liquid you add to many newer diesel trucks. The truck uses it to clean up exhaust, so it can meet emissions rules.

Toyota A90
Car

Toyota A90

The Toyota Supra is a sports car made for fast driving and sporty handling. The podcast mention about “DEF” is about a system some diesel cars use to reduce pollution, and they’re talking about how often parts of that system might fail. If you own one, that can affect how expensive repairs are.

Concept

no guidance

They’re saying the EPA hasn’t given clear rules yet. Without clear answers, it’s hard to know what will be considered legal or compliant.

Concept

temporarily disable these systems

They’re talking about whether you can turn emissions equipment off for a short time. The key point is that it’s supposed to be temporary, not a permanent removal of the system.

Concept

override

An override is a way to force the emissions system to behave differently than it normally would. Whether it’s allowed depends on how it’s done and whether it’s meant to be temporary.

Concept

mobile source side of things

“Mobile source” just means vehicle emissions. They’re saying the rules/allowances for vehicles may be different from the rules for agriculture or other categories.

Concept

next administration comes in undoes this

This highlights how regulatory enforcement and policy can change with political leadership. For emissions-related modifications, that means today’s “legal” interpretation may not remain stable, affecting long-term legality and compliance strategy.

Concept

emissions compliance feedback loop (administration talking to the field)

They’re talking about regulators getting input from people who deal with these trucks every day. That helps them understand what’s actually happening and adjust the approach.

Term

after-treatment

After-treatment is the part of a diesel that cleans the exhaust after the engine makes it. If it detects a problem, the truck may reduce power to stay within emissions rules.

Term

DEF sensor

The DEF sensor monitors conditions related to the diesel exhaust fluid system, such as fluid level and/or quality, so the vehicle can dose DEF correctly. If the sensor is stuck or inaccurate, the truck may think DEF isn’t available and trigger de-rating or other protective behavior.

Concept

endangerment finding

An “endangerment finding” is basically a government conclusion that certain pollution is dangerous. The important nuance here is that the finding for climate pollution doesn’t automatically decide everything about other types of exhaust pollution.

Concept

greenhouse gases

Greenhouse gases are the emissions that contribute to climate change. The key point is that rules for climate pollution can be separate from rules for other types of air pollution.

Concept

criteria pollutants

Criteria pollutants are the main types of dirty air emissions regulators focus on for health reasons. The transcript is saying that climate-related findings don’t automatically settle how these other pollutants are regulated.

Term

emissions and meet current standards

This is about regulatory compliance: whether a vehicle can be modified (or emissions equipment removed) while still meeting the emissions limits required by law. In practice, if the OEMs and certification process can’t achieve the required standards, it affects what’s legally and technically feasible for aftermarket changes.

Concept

going all electric

The speaker is saying that if diesel emissions rules get too hard to meet, companies may decide to focus on electric vehicles instead.

Concept

current tier is too high

A “tier” is like an emissions difficulty level set by regulators. If it’s “too high,” it means the rules are stricter than manufacturers can realistically meet right now.

Concept

go back to something a little bit more reasonable

This is about changing the emissions rules to be less strict. If the rules get easier, manufacturers may be able to comply without needing as aggressive technology.

Concept

calibration

Calibration is the car computer’s settings for how it runs and how it manages emissions equipment. Changing calibration can change how clean the exhaust is and whether the car passes emissions rules.

Concept

2007 vs 2012 emissions standards

They’re comparing older and newer emissions rules. Even if a diesel is cleaner than older limits, passing today’s inspection depends on what the car is actually doing and how it’s tested.

Concept

emissions to 2007 levels

They’re talking about making the car’s emissions match older legal limits. Since rules get stricter over the years, meeting an older standard doesn’t always mean the car is compliant with today’s requirements.

Term

smog testing

Smog testing is the official check to make sure your car isn’t polluting too much. On newer cars, the test can also look at whether the car’s emissions systems have been properly checked by the computer.

Term

readiness monitors

Readiness monitors are like the car’s self-check results for emissions systems. If the car hasn’t run (or can’t complete) those checks, the inspection computer may reject it even if it seems to be running normally.

Concept

consent decrees

Consent decrees are court-approved agreements that require certain rules to be followed. In emissions cases, they can strongly influence what changes are allowed to a vehicle’s emissions systems.

Term

OBD

OBD is the car’s self-check system for emissions and other important parts. If you change things that affect how the car reports emissions data, it can cause legal trouble and may also affect inspections.

Term

tuner

A tuner is a device that changes how the car’s computer runs the engine. It can make the car feel stronger, but it can also interfere with emissions systems and what the car reports during inspections.

Term

chip

A chip is a way to change the car’s computer settings. It can change performance, but it may also affect emissions controls and inspection results.

Term

emission standards

Emission standards are the rules that limit how much pollution a vehicle is allowed to make. They affect how the car is designed and how it’s tested or monitored.

Term

particulate matter

Particulate matter is basically soot particles from burning fuel. Diesel engines need systems to reduce it so they don’t exceed pollution limits.

Term

aftermarket

Aftermarket parts are made by companies other than the car maker. The discussion is basically saying aftermarket options shouldn’t automatically be viewed as bad—some can work well and help with emissions equipment.

Concept

blanket prohibitions

Blanket prohibitions are rules that ban whole categories of changes without making exceptions for good solutions. The point here is that strict blanket rules may slow down progress on emissions fixes.

Term

OEM catalytic converters

OEM parts are the same brand/spec as what came on the vehicle from the factory. Here, the point is that some places may require you to use factory-spec catalytic converters rather than cheaper aftermarket ones.

Toyota Land Cruiser
Car

Toyota Land Cruiser

The Toyota Land Cruiser is a tough, long-lasting SUV. The hosts use it here because replacing catalytic converters on a Land Cruiser can be very expensive if you’re forced to buy OEM parts.

Term

EGR systems

EGR stands for Exhaust Gas Recirculation. It helps reduce pollution by sending some exhaust gas back into the engine so it burns more cleanly.

Term

derated

Derated means the truck turns down its power. It does this when it detects an emissions problem so you’ll get it fixed.

Term

DF sensor

That sensor is how the truck checks whether the DEF system is working correctly. If it thinks something’s wrong, the truck can reduce power to push you to fix the emissions system.

Term

OEMs

OEMs are the automakers that make the truck and its emissions systems. They’re the ones who have to update the software and hardware to follow the rules.

Term

regen's

Regen is the process where the truck cleans out the soot filter. It burns the soot off, usually when the vehicle decides conditions are right.

Term

DEF system

The DEF system is the whole setup that stores DEF and injects it into the exhaust in the right amount. In this segment, they’re saying the injection behavior stays the same.

Term

doses

Dosing means how much DEF the truck injects and when. The computer controls it so the exhaust cleaning works properly.

Term

knock sensors

Knock sensors listen for signs that the engine is burning fuel in an abnormal way. If the ECU detects that, it can adjust engine operation to protect the engine.

Term

DEF fluid

DEF fluid is a special liquid diesel trucks use to clean up exhaust. If the truck doesn’t have enough DEF or the system thinks something is wrong, it will warn you and may eventually limit how far you can drive. That’s why you’ll see warnings like the check engine light.

Term

check engine light

The check engine light means the car’s computer found a problem. On diesel vehicles, it often relates to emissions systems, not just the engine itself. Sometimes the car will still run, but it may limit power or get worse over time.

Term

boot

Here, “boot” means a rubber connection in the turbo/boost piping. If it tears or leaks, the turbo can’t pressurize the air correctly. That can lead to other problems later, including emissions warnings.

Term

boost leak

A boost leak means the turbo’s pressurized air is escaping through a crack or loose connection. The engine doesn’t get the boost it expects, so it can run less efficiently. That inefficiency can also make the exhaust system work harder.

Term

turbo to the intercooler

After the turbo compresses air, it usually goes to an intercooler to cool it down before it enters the engine. If there’s a leak in that route, the engine may not get the right amount of air. That can cause performance problems and can also affect emissions.

Part

DPF replacement

A DPF is a filter that catches soot from a diesel exhaust. If it gets too clogged and can’t clean itself, the fix can be replacing the whole filter, and that’s where the big repair cost comes from.

Part

exhaust system

On a diesel, the exhaust system isn’t just the pipes—it also carries exhaust through the emissions equipment. If something goes wrong, the truck can end up needing major repairs and may not run.

Concept

these pipes stop up

If the exhaust pipes get clogged, exhaust can’t get out the way it should. Even if the engine is trying to push exhaust out, the blockage prevents flow, which can make the truck run badly or fail emissions-related checks.

Term

intake

The intake is where air goes into the engine. If something in that path is restricted or broken, the turbo can’t deliver the right air pressure.

Term

back pressure

Back pressure is how hard it is for exhaust gases to get out. If the exhaust system is restricted, pressure builds up and can stress engine parts.

Term

emissions systems

Emissions systems are the parts that clean up exhaust so the vehicle meets pollution rules. They can wear out or get overwhelmed over time, especially if the engine is pushed hard.

Term

torqued to spec

Torqued to spec means the bolts were tightened to the exact tightness the manufacturer calls for. If they’re not, parts can loosen or not seal properly and cause trouble.

Term

warranty coverage

Warranty coverage is what the manufacturer agrees to pay for when a covered part breaks. The key point here is that warranties often cover the repair itself, but not the extra costs that happen because of the failure.

Concept

consequential damages

Consequential damages are costs that happen indirectly because of a failure—beyond the original broken part. In the transcript, the example is that an emissions-system failure can lead to other expensive outcomes (like additional repairs or downtime) that may not be covered even if the failed component itself is under warranty.

Term

catastrophic drivetrain failure

“Catastrophic drivetrain failure” means the vehicle’s main power system breaks in a big way—often involving the transmission or related parts. The point they’re making is that even if the broken part is covered, the extra fallout costs may not be.

Term

rent a car

The transcript discusses the need to rent a replacement vehicle when the primary truck is unavailable due to repairs or coverage disputes. It’s used to illustrate how out-of-pocket costs can arise beyond warranty coverage.

Term

warranty repair

A warranty repair is when the manufacturer pays to fix something on the truck. But warranties often don’t pay for everything around the repair—like lost income or other knock-on expenses.

Concept

lost productivity time

“Lost productivity time” refers to the economic impact of a vehicle being unavailable—such as downtime while waiting for repairs. The segment emphasizes that these indirect business impacts may not be covered by standard warranty repairs.

Term

supplemental insurance

Supplemental insurance is extra coverage you buy to protect against costs that your main insurance or warranty won’t pay. It’s often used when you’re worried about gaps like downtime-related losses.

Term

business E&O policy

An E&O policy is insurance that helps protect a business from certain kinds of mistakes or failures that lead to financial claims. In this context, it’s mentioned as a way to cover losses when a truck issue affects business.

Concept

warranty failures

“Warranty failures” are repairs that a manufacturer might refuse to cover. The hosts are saying companies plan for situations where people try to save money in ways that can lead to expensive problems later.

Term

emission systems

“Emission systems” are the parts on a diesel that help reduce harmful exhaust. The point here is that they usually last a long time, but if you don’t maintain the truck, other problems can show up.

Concept

preemptive maintenance

“Preemptive” (preventive) maintenance is proactive service done on a schedule to prevent failures before they happen. The hosts connect it to emissions-system durability and to the reality that some owners/operators can’t afford the upkeep needed to avoid expensive downstream problems.

Concept

preventative maintenance

Preventive maintenance is regular care meant to stop problems early. Here, it’s tied to avoiding expensive downtime and knock-on issues.

Concept

deleting ... in advance so that way they never had the problem

This is about doing the bypass/removal before anything breaks, instead of waiting until the truck has an emissions problem. Some owners do it to avoid downtime and expensive repairs. But it can still be risky legally and environmentally.

Concept

cost of deleting versus cost of replacement

The speaker is talking about a money decision: do you pay to fix the emissions equipment, or do you remove/bypass it instead. Repairs can be costly, so some people choose the cheaper option. The legal side then considers those costs when arguing sentencing.

Concept

aging fleet operation

An “aging fleet” means a company’s older trucks. Older vehicles often need more repairs, including emissions parts, so the hosts are discussing cost pressure as part of the decision-making.

Term

EPA or DOJ

EPA and DOJ are U.S. government agencies involved in enforcing environmental rules. The discussion here is about how their stance and enforcement priorities affect whether emissions deletes get prosecuted.

Concept

SCR (selective catalytic reduction)

SCR is the system that uses DEF to make diesel exhaust cleaner. It’s designed to cut down on nitrogen pollution that comes out of the tailpipe.

Concept

emissions enforcement

Emissions enforcement is how the government checks whether vehicles are meeting pollution rules. If enforcement gets stricter or changes, it can change the risk and consequences for people doing illegal emissions modifications.

Concept

accountability between the administration

This refers to a governance/oversight concept where one part of the government is expected to monitor and hold another part responsible for outcomes. In the context of emissions policy, it implies follow-through on regulatory actions and measurable improvements rather than vague promises. For listeners, it’s a reminder that policy enforcement and updates can change over time.

Concept

holding environmental criminals liable

This means the government can prosecute people for breaking environmental rules, not just issue warnings. With diesel vehicles, it can apply when emissions systems are bypassed or modified to cheat pollution controls.

Concept

buyout

A buyout is basically an offer for employees to leave their job and get paid to do so. If key people leave, the agency’s focus and enforcement approach can change.

Concept

environmental enforcement migrating to the states

The speaker is saying enforcement pressure may be moving from the federal government to individual states. That means the risk of getting in trouble for emissions deletes can depend on your state.

Concept

tampering

Here, “tampering” means messing with the emissions system on purpose. The concern is that the truck will pollute more than it’s supposed to.

Concept

state legal theory

A “state legal theory” is basically how a state argues its case in court using its own laws. So even if federal enforcement slows down, a state might still go after emissions cheating.

Concept

future enforcement

“Future enforcement” here means how aggressively regulators (like the EPA) will pursue violations related to emissions rules and modifications. The speaker suggests enforcement may become less extreme after agencies back off certain policies, which affects how risky DEF-related modifications may be.

Concept

regret in the agency

They’re saying the agency may feel bad about how some past cases were handled. That matters because it could lead to less strict enforcement going forward.

Term

diesel engine

They’re discussing getting a diesel engine replacement fast, especially when you can’t wait for shipping or parts availability. They also mention that what you need can change if your truck is modified or if you tow a lot.

Concept

stock vs modified truck

They’re pointing out that if your truck is stock, it’s usually easier to replace parts with factory-compatible options. If it’s modified, you may need a different setup so everything works together.

Concept

towing heavy

Towing heavy means you’re pulling loads regularly, which puts more stress on the truck. That can make it more important to get the right engine and parts so it performs reliably.

Company

DFC Diesel

DFC Diesel is a company that sponsors the show. They also help with technical questions, so they’re involved in the diesel repair/remanufacturing world.

Powerstroke
Car

Powerstroke

Powerstroke is Ford’s diesel engine name. The episode is talking about rebuilt Powerstroke engines that are sold with quality testing and a warranty.

Concept

ISO 9001 2015 standards

ISO 9001:2015 is a set of rules for how a company runs its quality process. If a remanufacturer follows it, it usually means they have consistent steps and checks so you’re less likely to get a random-quality product.

Concept

quality testing validation

This phrase means the engine isn’t just rebuilt—it’s also tested to make sure it meets the expected specs. That’s important because it reduces the chance of getting a reman engine that fails early.

Concept

industry leading warranty

A warranty is the company’s guarantee that if something goes wrong, they’ll help cover it. A better warranty usually means the company expects the engine to last.

Concept

OEM engine

OEM means “original equipment manufacturer,” like the engine as it was made for the truck. The hosts are saying some people want more than a basic stock-style replacement.

Concept

core, street, tow haul

These are different versions of rebuilt engines for different driving needs. One might be more basic, another might be tuned or built for normal street use, and another for towing heavy loads.

Concept

speed of air series

“Speed of air” sounds like a performance-focused engine option. The idea is usually to help the engine move more air efficiently, which can improve how it pulls and responds.

Part

pistons

Pistons are a core internal engine component that convert combustion pressure into crankshaft motion. In diesel performance builds, piston design/materials and friction characteristics can affect efficiency, power output, and how long the engine survives under higher loads.

Concept

fuel economy

Fuel economy is basically your “miles per gallon” (or equivalent). They’re saying certain engine upgrades can help the engine use fuel more efficiently.

Concept

lead time

Lead time is how long you have to wait after you order parts. Short lead times mean you can finish your build faster.

Part

rods

Rods are the parts that connect the piston to the crankshaft. Stronger rods can help the engine survive when you push it harder.

Part

cranks

The crankshaft is the main rotating shaft that the engine uses to turn power into motion. Upgraded cranks can help the engine handle more torque safely.

Part

valve train upgrades

The valve train is what controls the engine’s breathing—when valves open and close. Upgrades can help the engine perform better and last longer when pushed.

Concept

lack of lubricity

Diesel fuel has to act like a lubricant inside the fuel system. If the fuel doesn’t lubricate well, parts can wear out faster and repairs get expensive.

Company

Hotshot Secrets

Hotshot Secrets is a company that makes products for diesel/fuel. Here they’re credited with a fuel additive/formula intended to help protect the engine.

Term

injectors

Fuel injectors are the parts that spray fuel into the engine. If they get dirty, the engine can run worse and may need expensive repairs, so cleaning them is a big deal.

Term

C-tane

“C-tane” is about making diesel easier to ignite. When ignition is better, the engine can start more smoothly and burn fuel more effectively.

Term

diesel fuel

Diesel fuel quality can change depending on where you buy it and how it’s stored. If the fuel isn’t great, it can cause problems over time, so they’re recommending an additive to help protect the engine.

Company

HotshotSecret.com

HotshotSecret.com is a website that sells products for diesel trucks. Here, they’re advertising a diesel fuel additive and giving listeners a discount code.

Term

federal government

The federal government sets some rules, but states can have different laws or enforcement. So what’s allowed in one place might not be allowed in another.

Concept

criminal to civil

“Criminal to civil” means the legal consequences shift from serious criminal prosecution to more administrative or lawsuit-style enforcement. That can change how risky enforcement feels for companies or individuals.

Concept

LCA

LCA means looking at pollution and environmental impact over the whole life of something, not just what comes out of the tailpipe. So a system might reduce exhaust pollution, but the analysis also counts manufacturing and other stages.

Company

NASA

NASA is brought up as an example of an organization that uses a broader way of measuring environmental impact. The takeaway is that the “rules” for measuring pollution can change the argument.

Term

oil gets diluted

Oil dilution is when fuel ends up mixing into the engine oil instead of staying in the combustion process. That makes the oil “thinner” and less able to protect the engine. Over time it can wear the engine out faster.

Concept

manufacturing costs

This is the idea that the pollution story doesn’t end at the exhaust. Building a vehicle (and replacing it sooner) also creates emissions. So a change that looks good on paper can be less beneficial when you count the full lifecycle.

Term

rare earth material extraction

This is about the mining needed to get certain materials used in modern products. That mining can have big environmental and human-cost impacts. The discussion is saying those costs should be counted when judging whether a change is truly “clean.”

Concept

cradle to the grave

“Cradle to the grave” means looking at the whole life of a product—how it’s made, how it’s used, and what happens to it later. The point here is that the rules being discussed may focus on only part of that lifecycle.

Term

soot

Soot is tiny black particles that can come out of diesel exhaust. It’s harmful to breathe, which is why emissions rules try to reduce it.

Term

hydrocarbons

Hydrocarbons are leftover fuel that didn’t fully burn in the engine. They can contribute to air pollution, so emissions systems try to reduce them.

Term

PM 2.5

PM 2.5 is tiny soot-like particles in the air. Because they’re so small, they can get deep into your lungs, which is why it’s a big deal for health and regulation.

Concept

wildfire offsetting emissions

They’re basically saying wildfires can create way more air pollution than cars do. So the question becomes whether cleaning up vehicle emissions really makes a noticeable difference compared to huge events like wildfire smoke.

Concept

emissions controls on modern engines

The segment claims modern engines and emissions-control systems are “already clean enough,” referring to the idea that newer diesel technology (and its aftertreatment) reduces regulated pollutants compared with older vehicles. This is a general argument about how emissions systems like catalysts and NOx/PM control hardware change real-world exhaust.

Concept

selective catalytic reduction (SCR)

SCR is the main “clean-up” system on many modern diesels that uses DEF to reduce harmful exhaust gases. If you delete DEF, the SCR system can’t clean the exhaust properly.

Concept

emissions penalties

“Emissions penalties” are the costs that come from not meeting government pollution rules. If a company or vehicle doesn’t comply, there can be fines or other financial consequences.

Term

two to four miles per gallon fuel penalties

A “fuel penalty” means the truck uses more fuel than it otherwise would. The speaker is saying emissions equipment can make the vehicle less efficient by a couple mpg.

Concept

Biden era

“Biden era” here just means the time period when the rules and enforcement were described as being especially tough. It’s being used to explain when the speaker thinks enforcement was at its peak.

Concept

NOx (nitrogen oxides)

NOx is a type of pollution that diesel engines can produce. It’s one of the main things emissions systems are designed to reduce. If DEF systems are deleted or disabled, NOx reduction can fail.

Topic

Tell Me What Happened podcast

This part is an ad/promo for a podcast called “Tell Me What Happened.” It doesn’t add car-tech knowledge here—it’s just letting you know the next season is out.

Brand

OnStar

OnStar is a service that connects a car to help and information services, and it’s tied to GM. In this clip, they’re just promoting their podcast, not discussing a specific car feature.

Part

DPFs

A DPF is a filter that catches the smoky soot from a diesel engine. If it gets clogged, the truck has to clean it out, and if that doesn’t work, repairs or replacement can get pricey.

Term

emissions testing

“Emissions testing” is the process of measuring a vehicle’s exhaust output (like NOx) to confirm it meets legal standards. The segment contrasts extremely expensive testing with more “reasonable basis” approaches, implying a policy debate about how strict and costly compliance should be.

Concept

mandatory car testing

Mandatory car testing means every vehicle has to be checked by the government, often on a regular schedule. The speaker thinks this kind of blanket approach wastes time and money instead of solving the real problem.

Concept

emissions certification testing requirements

They’re talking about rules that require emissions-related modifications to be tested and approved before they can be sold. The complaint is that the process is slow, costly, and overly restrictive.

Company

FDA

The FDA is the U.S. agency that regulates food and medicines. The speaker uses it as an example of how testing could be done more flexibly than the current emissions rules.

Term

dyno

A dyno (dynamometer) measures engine output—like horsepower and torque—under controlled conditions. In this context, the speaker argues that if tuners could test on a dyno themselves, it would reduce the cost and delay of getting aftermarket products approved.

Concept

administrative change

An administrative change is basically a change in how the government runs or enforces the rules. It can affect whether certain actions get targeted more or less heavily.

Concept

emissions defeat / illegal emissions modifications

“Deletes” in this context usually mean changing the truck’s emissions system so it doesn’t work the way it was designed to. That can be illegal because it can increase pollution.

Term

civil enforcement

Civil enforcement is when the government goes after you with fines and legal penalties, not necessarily criminal charges. Even if it’s “civil,” it can still be very expensive and disruptive.

Concept

criminal liability

Criminal liability means the government could treat the conduct as a crime, not just a civil violation. The segment warns that this risk may not be gone forever.

Term

Trump administration

The segment references the Trump administration in relation to EPA enforcement priorities and conversations with officials. It’s used to support the claim that the EPA leadership had little tolerance for emissions tampering.

Term

RFIs

In this context, RFIs are requests for information used by regulators to investigate compliance and gather evidence. The segment ties them to early enforcement efforts when emissions tampering was more widespread.

Concept

civil liability

Civil liability means you can still get sued or face penalties even if it’s not treated as a criminal case. In this segment, the point is that “criminal” isn’t the only risk.

Concept

end user liability

“End user liability” means the owner of the vehicle could be blamed for the illegal modification. The hosts are saying it’s hard for regulators to prove who did what and to enforce it consistently.

Concept

resource perspective

This means regulators may not be able to chase every violation because they don’t have enough people or time. The discussion is that enforcing end-user deletes nationwide would be very difficult.

Concept

Biden administration

They’re talking about the federal government’s approach under the Biden administration. The claim is that enforcement against owners wasn’t being pursued as aggressively as people feared.

Concept

enforcement action

An “enforcement action” is what happens when the government decides someone broke the rules and takes action against them. The point being made is that doing repairs on a deleted truck might be treated differently than installing the delete.

Concept

inspection sticker

An inspection sticker is proof that a vehicle has passed the required emissions/safety inspection for its jurisdiction. The transcript frames it like a gatekeeper for legality: pass the test and you’re allowed to drive, fail and you should be treated as not compliant. This is a key enforcement mechanism because it connects emissions compliance to real-world driving.

Concept

Congress and Senate

Congress and the Senate are referenced as the legislative bodies that would need to change the law to alter how enforcement works. The transcript implies that policy changes affecting emissions compliance and inspection enforcement require formal legislative action. It also mentions “signatures” as part of the process, indicating a political pathway to change.

Concept

ATF

ATF is a federal agency that deals with firearms and related public-safety enforcement. In the conversation, they use ATF as an example of how enforcement focus can depend on what an agency is responsible for. It’s an analogy for why emissions enforcement might be handled differently.

Concept

loophole for race vehicles, farm vehicles

People often wonder if race cars or farm trucks can legally bypass emissions rules. The point here is that there usually isn’t a clean, safe loophole—so trying to exploit one can still get you in trouble.

Term

mobile source vehicle

“Mobile source vehicle” is a legal/emissions category for vehicles that move and produce exhaust while driving. It’s important because the rules for those vehicles are usually strict and specific.

Term

reverse gear

They’re saying the “loophole” people talk about might hinge on a technical detail: whether the vehicle has reverse. If today’s race cars have reverse, that old wording may no longer help you.

Company

Borla exhaust

Borla makes aftermarket exhaust systems. The mention of an “EPA finding” suggests that exhaust changes aren’t just about sound—EPA rules can affect whether a product is legal or compliant.

Term

EPA finding

An “EPA finding” is basically the government saying whether something meets emissions rules. Here it’s being used to show that exhaust or engine modifications can get you in trouble if they don’t comply.

Concept

race vehicle loophole

People sometimes think “if it’s a race car, emissions rules don’t apply.” The point here is that the exemption is narrow—if it’s actually being used on public roads or sold for road use, regulators can still go after it.

Concept

emergency vehicles

Some vehicles used for emergencies can qualify for special rules. The hosts are saying these are real exceptions, not the kind of workaround people usually mean when they talk about “loopholes.”

Concept

farm equipment that is not operational

Some equipment used on farms may have special treatment if it’s not currently operating and needs temporary changes. The key takeaway is that regulators look at real-world use, not just paperwork.

Concept

out of country loophole

Some people think they can avoid U.S. rules by doing the business from another country. The discussion here says that doesn’t really protect you if the products end up in the U.S. or are tied to U.S. activity.

Concept

civil side

“Civil side” means the government can go after someone with fines or lawsuits, not necessarily jail or criminal charges. It’s a common way regulators enforce emissions rules.

Concept

dual illegality

“Dual illegality” is basically the idea that the same act has to be illegal in both places. If it’s not illegal where the person/company is located, it can be harder to take certain legal steps.

Concept

federalized delete rule

This means Canada may make a single national rule about whether DEF deletes are allowed. That would close gaps where deletes might be legal in one region but not another.

Concept

extradition

Extradition is when one country hands someone over to another country for prosecution. If the conduct isn’t illegal in both places, extradition may not be possible.

Concept

EPA legalize

This is about whether the EPA allows certain emissions changes. If you mess with emissions equipment, you can face legal trouble, so it’s important to know what’s actually permitted.

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