Fuel Trim Malfunction (P0170) Your Essential Guide

I am experiencing rough start and idle, usually the 2nd start of the day and CEL comes on. It will clear for a day, then come back. It is showing a P0170 code, ... hi. I have just joined the club and I need to no how to fix a error code p0170 fuel trim bank 1 problem . I have change the 2 lamba sensors ... The car seems to rev a lot higher than normal. It shifts around 4000rpms and 1st gear sometimes takes it to 20, 2nd to 40,and rest of gears happen fast. Long term fuel trim is down to 14.8 now, which seems to fix the CEL, but it's idling like poop now. Sputters a lot. The task is to see if you have a Rich or Lean condition, since the DTC code provided is quite general and doesn't tell a whole lot. 16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean. Possible Causes: Mass Air Flow Sensor (G70) defective, Intake System Leak(s). The P0170 is defined as “fuel trim malfunction, bank1.” This is a DTC (diagnostic trouble code) that is triggered when the fuel trim in cylinder ... A lot of people have had issues with these codes pointing to forgetting the secondary air pump hose on the front of the airbox. 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 ... Pull the vac line off the fuel pressure regulator and see if any gas drips out ... this means a bad regulator and will cause trim code..