1997 Mitsubishi Galant

[Gatores]

My son's car has a check engine light with the code P0170 Fuel Trim Malfunction Bank 1. Any ideas what this means or how it can be fixed without spending an arm and a leg?

Any help is apreciated.

Thanks,

Gatores wife, Susie

[jeffreyd]

if i remember right, the po170 code usually will apply to the maf sensor. it is located between the airfilter and throttle body. you can take it out usually just a wire plug and couple screws, clean or replace. the problem with this code is that it can also be put on by a vacuum leak, or fuel issue but since the maf is easy (usually) to get to. good luck. let us know what you find, i hope airjer gets on to assist.

[Jeremy airjer W]

Its usually a fuel trim issue whether its adding or subtracting fuel is the question. If its subtracting its running to rich. If its adding its running to lean.

I would start with at least seeing if the MAF was dirty. If it is a quick cleaning will usually get them back into shape.

Another possibility is there is a vacuum leak. If its bad enough to effect fuel trims than it should be causing a driveabilty issue as well.

I assume its 4 cyl. engine?