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Old 03-10-2013, 11:50 PM   #1
Scooby Newbie
Member#: 213930
Join Date: Jun 2009
Chapter/Region: Tri-State
Location: Lawrencville, NJ
2002 02wrx

Default rich fuel trim; been through the basics

2002 wrx and got the cel that wont go away. po171 or 2; rich fuel trim.

checked alot...So far

1) replaced o2 sensors, ran better, gauge reads normal, slight lag after letting go of pedal, however light came back on tonight for third time; same code
2-3) cleaned maf and air filter
4) no vacume leaks pre or post turbo
5) new plugs
6) battery is good

Also, gas light has been coming on when im not even low. when coming to a stop, idle drops hard.

Could it be a burnt cat? I have a catless set up, was tuned to be catless, but had to put one in to pass inspc; just visual. Just never swapped it back to my test pipe. Should I any way, people tell me it doesnt matter?


Any suggestions...
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Old 03-11-2013, 12:26 AM   #2
Scooby Specialist
Member#: 327495
Join Date: Jul 2012
Chapter/Region: Tri-State
Location: Ozone Park, Queens, New York
2012 Impreza WRX 5DR
Plasma Blue


Did you tune it with an AP?
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Old 03-11-2013, 03:02 PM   #3
Eerc WRX
Scooby Newbie
Member#: 215706
Join Date: Jun 2009
Chapter/Region: NESIC
Location: Frederick, MD
02 Impreza WRX


There is a pretty good write-up about that code here.


I usally get a loose vacume hose below the BOV.
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