Fuel System Insight Unveiling Engine Code P0171

If you're reading this, you've likely seen the OBD-II scanner flash the P0171 fault code – an indication that the engine control module (ECM) ... That's a lean code. Any unmetered air that gets in the system can cause that as well as low fuel pressure. If your canister hose was loose ... 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. code issue is lean condition bank 1 I replaced PCV valve and hose. I cleaned MAP sensor. I installed a hose clamp on passenger side vacuum ... p0171 code (lean bank 1) ... The O2 sensor only cuts in (closed loop with ECM) once the engine has warmed up and coolant temp has exceeded 158F/ ... P0171 and P0174 are codes for a lean condition. This is usually caused by a vacuum leak. Sometimes it is caused by a faulty oxygen sensor, but ... PCM & Fuel Systems - Engine Code P0171 - #P0171- According to the book it means System adaptive feul too lean (bank 1) . a problem with the AF sensor · a small error in estimation at the ECU of when air should be passing the AF sensor from each bank · injectors that ... More often than not P0100, P0110 and P0171 are related to the MAF being dirty or worst case damaged. Normally you start with the lower codes ... 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!