P0303 is a cylinder specific misfire code, which means that Cylinder 3 is misfiring and causing the code. ![]() Mileage may suffer as well when your A4 has P0303. The engine is also not firing all of the fuel, so raw fuel is also passing through cylinder 3 into the exhaust. Driving with a misfire can damage the vehicle’s catalytic converter. Unlike a lot of the OBDII codes, this code has to do directly with engine combustion. These particular codes indicate that there is a misfire in one of the other cylinder’s as well.įixing P0303 should be considered a high priority. It will often be accompanied by codes P0301, P0302, etc…. The nice thing about P0303 is that it’s a cylinder specific trouble code, which makes diagnosing the problems simpler than P0300, which means that the cylinders are randomly misfiring. P0303 should not be ignored, and can be a threat to the drivability the Audi A4. P0303 is a relatively common Audi A4 trouble code.
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