What are the common check engine light codes for Audi A4?

I recently got a check engine light on my Audi A4 and I am wondering what the common error codes are that could trigger this warning. Can anyone provide some insights?

There are several common check engine light codes that Audi A4 owners may encounter, including P0171 (lean fuel mixture), P0299 (turbocharger underboost), and P0420 (catalyst system efficiency below threshold). If your car displays one of these codes, it is important to get it checked by a mechanic to prevent potential further damage.

I have been driving Audi A4s for the past 10 years and have come across various check engine light codes, such as P0300 (random/multiple cylinder misfire), P0456 (evaporative emission system leak detected), and P0102 (mass or volume air flow circuit low). It is important to address these issues promptly to avoid any major repairs in the future.

As a certified mechanic specializing in Audi vehicles, I have noticed that a common cause of check engine light is a faulty oxygen sensor. This can trigger codes such as P0130 (oxygen sensor circuit malfunction), P0135 (heater circuit malfunction), and P2271 (air leak in intake boot). If you experience any of these codes, it is best to replace the oxygen sensor.