I recently got the code P0171 on my Audi A4 and I don't know how to fix it. The check engine light is on and the car is running rough. What could be causing this and how can I fix it?
ReplyThe error code P0171 on your Audi A4 is indicating a problem with the fuel system. This could be caused by a vacuum leak, faulty oxygen sensor, or a clogged fuel filter. I recommend checking the vacuum lines and replacing the oxygen sensor. If the problem persists, it may be necessary to take your car to a mechanic for further diagnosis.
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