Engine Code P0171 Diagnose and Resolve with Expert Guidance

The P0171 code is linked to your car having clogged fuel injectors, implying the engine controller is sensing a lean state. If the injector is ... P0171 means bank 1 is lean and is near the limits of what the PCM can adapt to. This code and its sister, P0174(Bank 2) are common sights on ... The engine seems to be running really rich (can smell a lot of gas at startup). I've checked for exhaust leaks, did my best to check for a vacuum leak, and ... The answer appears to be: If it is not a vacuum leak then the MAF - Mass Air Flow Sensor or A/F Air/Fuel Sensor if there is a P1135 error code also! Your vehicle may get the P0171 code due to dirty sensors or a faulty fuel pump. Specifically, mass airflow sensors are known to trigger this error code, as this ... The P0171 engine code is serious—it means that your engine is running too lean in bank 1. Understanding the cause of a P0171 engine code can ... The P0171 OBD-II code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. The check engine light came on after I washed the engine. I did not use high pressure. I just used a scrub brush with soap and cleaned everything real good. P0171 means the computer is correcting for a lean condition on bank 1 (the rear bank.) A lean condition can be caused by any number of things. The check engine code was P0171, a lean fuel trim. He cleared the code and checked for air leaks and said the car needed a new PCV valve and he installed one.