Conquering P0170 Fuel Trim Malfunction Troubleshooting for Beginners

You're after cat lambda is showing a lean condition +16% this is the LTFT but the Short trim ( stft ) is in the range 2.3%. It could be the MAF or it could be a vacuum leak. The way to find out is to read live data with a scan tool that can do that. ANY ONE HAD THIS CODE ON THEIR BMW Z3 1.9 (2000) THINK IT MEANS FAULT IN FUEL TRIM (BANK 1) HAVE CHANGED THE FUEL FILLTER BUT STILL GET THE ... A fuel trim malfunction indicates that the FI system cannot fully compensate for either a rich or lean condition. The engine code seems to relate to a plausability failure. There are several subtypes listed in the manual, but they all relate to exhaust leak ... The P0170 code indicates that the fuel trims have reached an abnormally low or abnormally high value for a specified amount of time. Some 2015-2016 f-super duty vehicles equipped with a 6.7l diesel engine may exhibit an illuminated MIL with DTC P0170 (fuel trim bank 1) stored in the ... The fault code P0170 can be caused by parts like the fuel filter, fuel pressure regulator or the air mass meter. The adaptive values in the ECU are adjusted so ... P0170 means there was a malfunction in the computer's control of the air:fuel ratio. It also indicates that the fuel trims reached their limit of adding fuel. mine was bad front 02 sensor. If you have a pocket logger then pulg it in and see what the sensors operating range is. If its not moving at all ...