I have a BMW 316i 1.9 (M43). I'm getting a P0170 error code and I'm trying to find out what part I need to replace. It points to the Lambda O2 Sensor but I just want to be as sure as I can be. I have an ELM327 based OBDII reader and it registers the following:-
Long Term Fuel % Trim Bank 1 = 20%
I also have a possible problem with the Intake Air Temperature. Sometimes, the sensor fails to read anything (for just one second) and then itís OK again.
There are two items which show ďNO DATAĒ which Iíve no idea if a sensor is broken if itís simply a case that there is no sensor at all. The No Data items are the Fuel Pressure and Intake Manifold Pressure.
I have a list of all my readings with the car simply idling. Are the expected values for these published anywhere so I can compare what Iím getting against what I should get ?