I recently came across the error code P0171 on my Audi A4. The check engine light is on and the car is running rough. I'm not sure how to go about troubleshooting and fixing this issue. Any advice would be greatly appreciated.
ReplyError code P0171 indicates a lean air-fuel ratio, which could be caused by a variety of reasons such as a faulty oxygen sensor or a vacuum leak. It's best to start by checking for any visible issues before moving on to using an OBD-II scanner.
I had this issue with my Audi A4 and it turned out to be a faulty mass air flow sensor. Replacing it solved the problem for me. It's worth checking this component if you can't find any other obvious problems.
Sometimes, a simple fix like replacing the gas cap can resolve the P0171 code. It's important to make sure the gas cap is tight and functioning properly before getting into more complicated troubleshooting.
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