Fuel System Conundrum P0170, the Diagnostic Journey

Well-Known Member ... The P0170 is based upon a rich mixture that the PCM is trying to lean out when it reached the end of its lean range. Perhaps ... There is a limit to how much the ECM can trim the fuel mixture and when the limit is reached for a specific amount of time the ECM will set the ... Your code is "Fuel trim malfunction (bank 1) " , so this means your problem is likely to be your O2 sensor on your driver's side of the engine, ... P0170 Fault ... Anyone on here pull a P0170 code? (Bank 1 Fuel Trim Fault) Looking for some guidance on how to proceed. what car is this on? a gas cap or a fuel pump o-ring problem would kick a evap leak if it was an obd2 car, a po170 is a fuel trim problem, which ... P0170 indicates a fuel trim malfunction in Bank 1 of the engine. This means the engine control module (ECM) is having difficulty maintaining the ... It reads like the engine is overfuelling, how old is the car ? it's recommended to replace the oxygen (lambda) sensors every ten years or so. I have this code. I changed the MAF sensor because the EGR valve is working and spraying carb cleaner around the intake gasket had no effect. P0170 and P0173 means that the system tried to go outside of the fuel trim limits. Now this can be usually caused by a bad mass airflow sensor, ... It showed codes: P0170, P0111 and a code for the volumetric air flow (dont remember the code). Cleared them, P0170 came afterwards. I got a ...