O2 sensor
The O2 sensor checks how much oxygen is in the exhaust. The car uses this info to decide how much fuel to add, helping it run smoothly and cleanly.
An oxygen sensor monitors the amount of oxygen in a vehicle’s exhaust gases and sends this data to the engine control unit (ECU) so it can adjust fuel injection for optimal combustion.
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"The O2 sensor was sending off codes and the air pump was having problems."
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"So you need to take it to your Chevrolet dealer, or whomever you take it to, and ask them to test the O2 sensor. They can scan it if they want."
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