P0171 OBD2 Diagnostic Code for Volkswagen Passat 2004

Volkswagen Passat 2004 owner experiencing OBD2 diagnostic code P0171. This code indicates a lean air-fuel mixture in the engine, which may be caused by issues such as faulty oxygen sensors, vacuum leaks, or problems with the fuel system. The vehicle may exhibit symptoms like poor acceleration, reduced fuel efficiency, or engine misfires. For accurate diagnosis and repair, it is recommended to inspect the intake system, fuel pressure, and sensor readings using an OBD2 scanner.