B6 S4 code P0172
2nd Gear
Joined: Sep 2008
Posts: 1,111
From: kentucky
well p0171 and p0174 are lean codes, im guessing this is a rich code. check the airfilter for one, you could also have a faulty fuel pressure regulator, or maybe a saturated canister. im not a specialist on the B6, but those are where i would start.
btw, p0171 and p0174 are bank sensitive, so if that is your only code, it is that bank specifically. i think bank 1. but you could also have a contaminated MAF, ive seen those cause that rich condition as well..
btw, p0171 and p0174 are bank sensitive, so if that is your only code, it is that bank specifically. i think bank 1. but you could also have a contaminated MAF, ive seen those cause that rich condition as well..
SoCal Crew Member
Joined: Nov 2006
Posts: 2,321
From: SoCal/ Norcal
P0172 is System too rich, bank 1
- fuel pressure regulator and residual pressure checking.(fuel pres. reg. is actually integraded in fuel filter on these cars/ easy fix)
-check fuel injectors
-check front and rear bank 1 (witch is passenger side) o2 sensors
- check evap emissions canister purge regulator valve -n80-
....maybe time for all new o2's and fuel filter... good luck
- fuel pressure regulator and residual pressure checking.(fuel pres. reg. is actually integraded in fuel filter on these cars/ easy fix)
-check fuel injectors
-check front and rear bank 1 (witch is passenger side) o2 sensors
- check evap emissions canister purge regulator valve -n80-
....maybe time for all new o2's and fuel filter... good luck
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