Mikke

Troubleshooting P0171 Code and Performance Issues on Audi A4

Hello everyone, I own a 2008 Audi A4 with 322,000 km on it. Recently, I've been experiencing several issues: the check engine light is on, the engine feels unsteady, there's jerking during acceleration, shaking while idling, and poor fuel economy. I scanned the car and got a P0171 code. I've already replaced the lambda sensors, but the problems persist. What could be causing these issues? Any advice or suggestions would be greatly appreciated!

The owner of a 2008 Audi A4 is experiencing issues such as an unsteady engine, jerking during acceleration, shaking while idling, poor fuel economy, and a P0171 code, despite replacing the lambda sensors. A suggested cause for these problems is a vacuum leak in the intake system, which can lead to the P0171 code and associated symptoms. Inspecting hoses and connections for cracks or disconnections is recommended as a potential solution.

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Start by checking for any vacuum leaks in the intake system, as these can cause a P0171 code and lead to the symptoms you're experiencing. Inspect hoses and connections for cracks or disconnections. Let us know if you find anything or if you need further guidance!

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