Aurel

Unstable idle problem on a gasoline Audi S3

Hello everyone, I own a 2010 Audi S3 with 130,000 km on the odometer, equipped with a gasoline engine. I have an unstable engine problem: the idle is irregular, and the car accelerates and decelerates on its own. I have already replaced the spark plugs, the relay, the fuel filter, the crankcase ventilation valve, and the air mass flow sensor. However, the problem persists and a P0171 fault code appears. Would you have any advice or solutions to offer me? Thank you for your help.

(Translated from French)

A 2010 Audi S3 with 130,000 km is experiencing an unstable idle, with the engine accelerating and decelerating on its own, and displaying a P0171 fault code. Despite replacing several components like spark plugs and the air mass flow sensor, the issue persists. A suggested solution is to check for vacuum leaks in the intake system, as these can cause the P0171 code and contribute to the idle problem.

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1 comment(s)

Check for any vacuum leaks in the intake system, as they can cause a P0171 code and lead to an unstable idle. Inspect hoses and connections for cracks or disconnections. Let me know if you find anything or if you have further questions.

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