p0170 fuel trim bank 1 malfunction 01 jetta gls 1.8t?

OBD II P0170

Fault Code Definition

Long Term and Short Term Fuel Trim are the methods used by the Power Train Control Module to continually adjust the air to fuel ratio in order to maintain the 14.7 to 1 (Stoichiometric) mixture that is ideal for combustion. Code P0170 is set when the Power Train Control Module has reached its operational limit with these adjustments.

Symptoms

Check Engine Light will illuminate

In many cases, no abnormal symptoms may be noticed

In some cases, the vehicle may get poor fuel mileage

In some cases, the engine may hesitate during acceleration

Common Problems That Trigger the P0170 Code

Intake Manifold vacuum leaks

Defective Mass Air Flow Sensor

Defective Mass Air Flow Sensor wiring or connections

Common Misdiagnoses

Oxygen Sensor is replaced when the real problem is a vacuum leak

Oxygen Sensor is replaced when the real problem is a defective Mass Air Flow Sensor

This Site Might Help You.

RE:

p0170 fuel trim bank 1 malfunction 01 jetta gls 1.8t?

I have an 01 jetta gls turbo & shortly after buying it, my check engine light came on. P0170 Fuel trim bank 1 malfunction. After the used car dealer I bought it from looked at it, he replaced the thermostat & turbo free of charge because they were both no good. He thought that this would solve...

Jetta 01

For the best answers, search on this site https://shorturl.im/ayeLt

Running too low fuel level will ruin in tank fuel pump real quick,and also let it suck all the debris inside the tank,clogging fuel strainer and filter,thus not enough fuel supply (lean codes).Replace fuel filter and maybe the fuel pump will be the solution.