check engine 171/172

DJSKJ · Oct 19, 2010

Check engine light came on and I ran the codes: 171 and 172. General info is 02 sensor, fuel filter,... Kind of non specific. Has anyone seen these codes and know of the potential fix? I know it is situation dependent, but I thought this might be a common problem.
Also, it has been raining here lately. Moisture issue?
I am going to run some fuel treatment through as my initial trouble shooting.

DJ

tjkj2002 · Oct 19, 2010

Are you sure on those code #'s? It would have to be a super freak accident to get both P0171 ans P0172 codes at the same time.

P0171-system too lean bank 1
P0172-system too rich bank 1

You sure it's not P0171 and P0174?--system to lean bank 1 and bank 2

Those codes are pre-upstream O2 sensors,most likely a vacuum leak of some sort or leaking/cracked exhuast manifold.But the pair(P0171/P0174) codes are the most hated codes by techs,very hard to trackdown in most cases.

Vranes17 · Oct 19, 2010

tjkj2002 said:
Are you sure on those code #'s? It would have to be a super freak accident to get both P0171 ans P0172 codes at the same time.

P0171-system too lean bank 1
P0172-system too rich bank 1

You sure it's not P0171 and P0174?--system to lean bank 1 and bank 2

Those codes are pre-upstream O2 sensors,most likely a vacuum leak of some sort or leaking/cracked exhuast manifold.But the pair(P0171/P0174) codes are the most hated codes by techs,very hard to trackdown in most cases.

man you simply amaze me with your bank of knowledge TJ, its just remarkable

Dave · Oct 19, 2010

Vranes17 said:
man you simply amaze me with your bank of knowledge TJ, its just remarkable

tjkj is a professional maniac...errr I mean mechanic........:smokin:

Dave

DJSKJ · Oct 19, 2010

Yes, those are the codes. I know they are contradictory. I ran it twice: checked the first time and said WTF so I reset and went out drove, light came on and I checked again. Same codes. So looks like I am stuck trouble shooting vacuum lines. Any other ideas?

DJ

Banditsteve · Oct 20, 2010

Blockage or contaminant in fuel injector? Stopping fuel getting through one minute and purging too much through the next? Or would that have its own code? Just chucking ideas about?

tjkj2002 · Oct 20, 2010

DJSKJ said:
Yes, those are the codes. I know they are contradictory. I ran it twice: checked the first time and said WTF so I reset and went out drove, light came on and I checked again. Same codes. So looks like I am stuck trouble shooting vacuum lines. Any other ideas?

DJ

With both of the codes I would have to personally look at the vehicle and the livedata via a scanner.This is one of those impossible code series.I'd be forking over the $$$ to have a dealership diagnose it.

LibertyFever · Oct 20, 2010

Vranes17 said:
man you simply amaze me with your bank of knowledge TJ, its just remarkable

I'd love to see him on Jeopardy when the category is Jeep Facts
(kneel)

check engine 171/172

DJSKJ

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