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 the check engine light issue but after 50 miles the light came back on & he is stumped. Does anyone know what this message could possibly be?
AnonymousGearhead
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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
Anonymous
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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...
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Jetta 01
Anonymous
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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.