Demystifying P0170 Fuel Trim Malfunction for Non-Mechanics

First off I have a 04 330ci. I get one and only fault code: P0170 Fuel Trim Malfunction (Bank 1). My car has 66k miles. Interestingly, I was ... 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. 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 ... 5 volt, if the entire fluctuation range is low then vacuum leak. Look at the worst high and low and compare. Vacuum leak they will tend to hang ... P0170 Fault ... Anyone on here pull a P0170 code? (Bank 1 Fuel Trim Fault) Looking for some guidance on how to proceed. 2 days of running the canned tunes and he started getting this code. He's erased it a couple times and it keeps coming back. He's all freaked out now. First thing to check for is vacuum leaks posted MAF. P0170 indicates a lean condition with unmeasured air. Second would be fuel. P0170 indicates a fuel trim malfunction in Bank 1 of the engine. This means the engine control module (ECM) is having difficulty maintaining the ... Comments Section ... The first step in diagnosing this is a contribution test to see if there's an issue affecting a single cylinder or if it's ... Code p0170 - A Fuel Trim Malfunction DTC results from your combined LTFT and STFT exceeding threshold, indicating that your tuning for closed- ...