Unlock the Secrets of P0170 Fuel Trim Malfunction

A code P0170 means that the PCM is either subtracting too much fuel and making the mixture too lean, or it's adding too much fuel to make the mixture too rich. 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 ... This code rarely happens in Asian and American-made cars. For American cars, the most common fuel trim error codes are P0171, P0174, P0172, P0175. 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. The Toyota FSM says the P0170 code for the 1995 LC is not set until fuel trims have reached +/- %35 and my trims are not even close to that. Fuel trims codes indicate that the ecu is seeing a reading that indicates that the air fuel ratios are incorrect. The sensor was replaced and ... Googling gives me P0170 Fuel Trim Malfunction (Bank 1) - fuel trim malfunction. It does have a rough idle but has not stalled. I've gone through ... First thing to check for is vacuum leaks posted MAF. P0170 indicates a lean condition with unmeasured air. Second would be fuel. VW DTC P0170 - Fuel Trim, Bank1 Malfunction. That would be the ECU informing you that the air / fuel mixture coming out of your engine is off, way off. 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 ...