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Question
I have a code PO 171 System Too Lean (Bank 1). I have changed both of the O2 sensors. I reset the codes and the check engine light usually stays out for about 25 miles. Some times it goes on almost immediately. Do you have any ideas? I would appreciate any help you can give me.
Thank you.
Jim
Hi Jim,
You could verify the wires going to both sensors are good. The brown/white wires should show 12V when the engine is running or being cranked. The brown/dark green wires should show continuity to pin 27 at the pcm. The black/dark blue wire on the downstream sensor should be continous to any ground point near by on the chassis. The dark blue/yellow on the downstream should show continuity to pin 51 of the pcm. The dark blue/light blue on the upstream sensor should show continuity to pin 30 of the pcm. The brown/light green wire at the upstream sensor should show continuity to pin 18.
None of the last three wires should be shorted to ground when assessed with the plugs being removed from the pcm. If those check out then a problem in the engine may be the issue and we can go from there.
Roland
PS Please 'rate' my answer and where you see the question about a nomination of me to be 'volunteer of the month' consider a 'yes' response. Thank you
Sorry for the delay but I just found your question in the pool.
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| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | Roland, Thank you for your very timely response! I didn't expect an answer so soon. I will be checking out your solutions on Monday (tomorrow) and see how things go. I have been going nuts with this vehicle for about a month now. I am the one that needs to apologize for the late answer. I received an email telling me that my question was being put in the pool and the next person who could help me would handle it as soon as they received it. (I figured at least a week!) It was by accident that I checked my emails this morning, otherwise the answer would have sat in my mailbox until Wednesday. If it helps I will be glad to tell the powers that be: Roland Finston for Volunteer of the Month! Thank you again. Jim | ||
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Roland Finston
Expertise
I specialize in Chrysler/Dodge/Plymouth cars, minivans, and SUV's for the model years 1982-2008 based upon my 50-year DIY experience, factory shop manuals and wiring diagrams. I offer fast repair advice to help you minimize repair costs by helping you diagnose and do it yourself. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty.
I take questions one at a time between 8am and 10pm CT and attempt to answer within 20 minutes. "Maxed Out" means I am answering another question of otherwise busy, so try again later.
There are answers on file to more than sixteen thousand Chrysler questions at your finger tips: put a few key words in the "find" box (above) or click on "view past answers" for a chronological list of my q and a's. Don't use "Add to this answer" if you still have a question...ask it. As to trucks and jeeps I only have manuals for the '04-'06 model years.
Experience
Five decades as a 'do-it-yourselfer' on domestic and imported cars
Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)
Education/Credentials
Degrees in Physics/bruised knuckles.
Awards and Honors
"Top expert of 2010" and "2011" at Allexperts.
Among top 50 experts for years 2006-2009 at Allexperts.
Quickest "average response time" at Allexperts (currently no. 1).
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