Pawlik Automotive Podcast Mar 23, 2026

2019 Mercedes A250 Spark Plugs

Annotations will appear as you listen

0:00

6:07

Car

Mercedes-Benz A-Class

This is a 2019 Mercedes-Benz A250, a small luxury hatchback. The shop is talking about what maintenance it needed at about 60,000 km, including replacing spark plugs.

Term

routine maintenance service

Routine maintenance is the scheduled work you do to keep a car healthy. It’s not fixing something that already broke—it’s preventing future issues.

Term

indicator on the dash

That dashboard light is the car’s reminder that it’s time for scheduled maintenance. It tells you which service interval the car thinks you’re due for.

Term

A4 service

Mercedes uses service codes like “A4” to tell you what maintenance should be done at that interval. Here, A4 includes an oil change, a basic inspection, and new spark plugs.

Term

oil and filter change

This is when the old engine oil is drained and replaced, and the oil filter is changed too. It keeps the engine lubricated and helps it run smoothly.

Term

spark plug replacement

Spark plugs help ignite the fuel in the engine. Replacing them on schedule helps the engine start easily and run smoothly.

Term

hot hatch

A “hot hatch” is a sporty hatchback—more performance and attitude than a regular family hatch. It’s meant to be fun to drive.

Term

oxygen sensor

The oxygen sensor checks what’s coming out of the exhaust. It helps the car adjust the fuel mixture so the engine burns fuel more cleanly and efficiently.

Concept

Modern engines often integrate components tightly (for example, placing the turbo and exhaust passages close together). This reduces the length of exhaust piping, helps keep exhaust heat where it’s needed, and can improve emissions and efficiency.

Concept

spool up faster

Spool up faster means the turbo starts working quickly. That helps the car feel more responsive instead of waiting for boost.

Term

ignition coils

Ignition coils create the spark that lights the fuel in the engine. If a coil fails, that cylinder may misfire.

Concept

threaded to the right size

Spark plugs have to be the exact right size for the engine’s cylinder head. If the threads or fit aren’t correct, the plug may not seat properly and the engine can run badly.

Term

ignition wire

The ignition wire is how electricity gets from the ignition coil to the spark plug system. Different engines use different connector styles to make sure the connection is solid.

Term

oriented spark plug

Some spark plugs have to be installed in a particular direction. That’s because the spark needs to happen in the right spot inside the engine.

Term

cylinder head

The cylinder head is the top part of the engine where the combustion happens. It’s also where the spark plug sits, so getting to it can be more work if you have to remove it.

Term

gap

The gap is the small space between the two electrodes on the spark plug. If it’s too big or too small, the engine may misfire.

Brand

Toyota

Toyota is used here as an example of a brand that can have very long spark plug service intervals. That means the plugs are designed to last a long time on some engines. But you should always check your own car’s schedule.

Term

threads pull out

If a spark plug is stuck for too long, you can end up damaging the threads in the engine. That can turn a simple job into a bigger repair. It’s one reason mechanics don’t recommend stretching plug intervals too far.

Term

carbon seep past the threads

Spark plugs can collect carbon deposits over time. If carbon builds up around the plug threads, it can help the plug “stick” in the engine. That makes future removal harder.

Concept

spark plugs that snap off when you take them out

This describes a serviceability problem where spark plugs fracture during removal, often due to design choices like thread material, heat range, or how the plug seats in the cylinder head. It’s a reminder that “engineering” decisions can turn a routine maintenance item into a bigger repair.

Concept

save 10 cents on this spark plug

They’re joking about how companies sometimes cut costs on parts by tiny amounts. Even if it saves money at the factory, it can make repairs harder later.

Concept

different eras of Mercedes

The hosts emphasize that Mercedes reliability and design philosophy change over time. For listeners, this matters because “Mercedes reliability” isn’t one uniform story—specific generations and engineering approaches can differ.

Company

Pawlik Automotive

They recommend Pawlik Automotive for Mercedes service in Vancouver. You can book an appointment online and they also have lots of repair videos to help explain what’s being done.

LIVE

Hi, it's Mark Bossard.

I'm here with Bernie Pawlik, Pawlik Automotive in Vancouver, BC, Canada.

Vancouver's best auto service experience.

And we're talking cars.

How you doing, Bernie?

Doing very well.

So today's guest is a 2019 Mercedes A250.

What was going on with this vehicle?

This vehicle came in for routine maintenance service, has about 60,000 kilometers, maybe

a little more on it.

And the indicator on the dash was indicating an A4 service.

So that's what we performed on the vehicle.

And what's an A4 service?

An A4 service is an oil and filter change, basic maintenance inspection, and a spark

plug replacement.

So here's our guest, slick looking Mercedes.

Yeah, yeah, that's a nice little car.

Hot hatch.

Yeah.

This is a turbocharged four cylinder.

Turbocharged four cylinder.

This is the engine bay with the covers and such on it.

Turbo's sitting right in the front there.

Right here.

Yeah.

And where it says hot here, is this the oxygen sensor or something?

That is an oxygen sensor, yeah.

So that's where the exhaust manifolds are running.

Turbo, the manifold, everything's all piled in right at the front there.

Modern engines, they really like to integrate things.

And if you keep it hot, it actually reduces emissions, makes it more efficient because

there's less piping for things to run to.

And of course, it'll spool up faster and be more efficient.

And these here, this little bank with these four, these are ignition coils underneath

that.

Ignition coils, yeah.

And the spark plugs.

So that's what the four was indicating was at the spark plugs.

This unit here.

That's one of the old spark plugs.

Now, we were talking about this earlier.

These are unique to this engine.

What's unique about this spark plug?

I used to just put almost any spark plug in my vehicles when I changed the plugs.

Yeah.

Well, yeah, they have to be threaded to the right size, of course.

And what's interesting about this is that on the top, on the left side, where the ignition

coil connects, they usually have either a sort of threaded section where the ignition wire

will slide onto it, or it'll be something in order to actually positively snaps together.

On this particular one, the actual, there's just a little wire inside the ignition coil

boot and it just touches on it and it's springy.

So it actually just provides the connection from the ignition coil.

So it's different.

And you were mentioning something about the orientation of the spark plug has to be,

is set for each cylinder?

How does that work?

Not on this particular engine, but there are some where the spark plug fitting is so finicky.

They actually make different spark plugs that are actually oriented.

So the threads are actually precisely set.

If you look on the right side of the spark plug, it's called the ground electrode.

That's that sort of hook thing.

Some engines, they actually have to be precisely located in the engine.

Of course, you can't see that because it's hidden.

You'd only ever see that if you took the cylinder head off and that would be a lot of work.

If it has an oriented spark plug, you have to put that one back in the same hole and

make sure you torque it properly.

So the ground electrode sits in exactly the right spot.

It's not the case with this engine, but still everything has to be

precise and there's a gap between that ground electrode and the center electrode.

And we always measure that before you put the spark plug in.

And that's been something that's been common for spark plugs since they were invented.

I don't know how long ago.

Yeah, way before our time.

I remember doing it, setting the gap.

Yeah.

Now, usually the gaps never need to be set nowadays.

It used to be that you'd get a certain spark plug and it would fit a variety of engines.

And you'd have to set the gap because different engines needed different gaps.

But nowadays the spark plug is very precisely made with the gap set.

But we always check it because it could be the box got banged or something got dropped.

And in that case, so I think I just send the spark plug back to my supplier and get another one

because they're meant to last a long time.

So you don't want to mess around and go, oh, a year later, the spark plug starts misfiring.

Make sure we do it right the first time.

So this is six years old, roughly six years of operation.

Is that a typical amount of time that spark plugs last?

Or is there such a thing?

They actually last a lot longer and a lot of engines.

Some of them I'm thinking like some Toyota engines that the spark plug replacement

interval is 192,000 kilometers.

Some cars will never even get to that mileage.

But on Mercedes, they use time and mileage.

The interval is usually from maybe 60,000 up to 200, depending on the car and the engine.

But when you leave a spark plug in for 200,000 kilometers, sometimes they don't come out very easily.

Threads pull out and things.

So it's probably not a great idea to leave them that long.

And that's just because of the heat cycling, the car getting cold and getting extremely hot

over and over almost welds the spark plug into place.

It does and a slight amount of carbon will seep past the threads of the spark plug.

And so that can assist in welding it into place too.

So it happens.

And then you have your Ford's where for certain era they designed really dumb spark plugs that

snap off when you take them out.

But that's because of engineering, not because of time.

Probably accounting saying we could save 10 cents on this spark plug if we did it this way.

Yeah, something like that.

I don't know.

It's fun working on cars because sometimes you go, why did they do that?

And then sometimes you see stuff and go, that's brilliant.

So I don't know if we've done one on this particular model of Mercedes.

How are Mercedes recent Mercedes for reliability?

Yeah, they're good.

Yeah, they're good cars.

They are definitely different.

They've changed over the years.

It's interesting looking at different eras of Mercedes.

But yeah, they're good.

They're reliable cars.

I think they're decent.

If you're looking for service for your Mercedes in Vancouver, the guys to see are at Pawlik Automotive.

You can reach them online on their website.

You can book your appointment right there.

pawlikautomotive.com.

Or you can watch a video on many, almost a thousand videos on there of repairs of all kinds

of makes and models of cars.

We've been doing this for 13 years.

You can also call them at 604-327-7112 to book your appointment.

They'll call you back.

They'll get ready for your appointment.

Pawlik Automotive in Vancouver, BC, Canada.

Thanks for watching again.

Thanks, Bernie.

Thank you, Mark.

And thanks for watching.

you

0:00

6:07

2019 Mercedes A250 Spark Plugs

About this episode