HELP! had the code PO171 show up (fuel system lean bank 1) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-19-2004, 07:39 AM   #1
Junior Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2004
Location: Pittston PA
Posts: 28
Thanks: 0
Thanked 0 Times in 0 Posts
marksssei is on a distinguished road
Default HELP! had the code PO171 show up (fuel system lean bank 1)

HELP me please my INTENSE PCM is due in tommorrow and today the DTC code PO171 came on. Can anyone tell me if they had that before and what fixed it. Thanks
marksssei is offline   Reply With Quote
Old 07-19-2004, 04:04 PM   #2
Senior Member
Posts like a Northstar
 
Join Date: Apr 2004
Location: Minneapolis, MN
Posts: 566
Thanks: 0
Thanked 0 Times in 0 Posts
CSFiend is on a distinguished road
Default

I just had the exact same code on a 95 Chrysler Concorde, and it was due to the intake manifold gasket leaking air. Have you done your lower intake gasket yet? If not, that'* more than likely the problem.
CSFiend is offline   Reply With Quote
Old 07-19-2004, 06:38 PM   #3
Senior Member
Posts like a Turbo
 
Join Date: Sep 2003
Location: Halifax Nova Scotia ASE Master Service Tech
Posts: 376
Thanks: 0
Thanked 0 Times in 0 Posts
A Bonnie Canuck is on a distinguished road
Default

The oxygen sensor is sensing a lean condition and is compensating by enrichening the fuel trim. Possible causes:
1. Vacuum leak. Check all vacuum lines and connections (how is the idle?).
2. Pull off the intake hose and check the MAF screen for obstruction.
3. Check throttle body, EGR and pipe, and intake for leaks.
4. Check the PCV for proper operation i.e. it rattles when shaken.
5. Check exhaust for damage and leaks before the first oxygen sensor.
6. Check that the O2 sensor is properly seated and the wiring undamaged.

The other steps involve having the scanner hooked up and checking fuel trim, idle air control solenoid and MAF (mass air flow) sensor.

Try those out and let us know how it went. Concentrate on having a good look around the intake including the injectors and throttle. Good luck.
A Bonnie Canuck is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
help..O2 sensor, lean bank one, strange things lobi Buick 8 02-24-2011 02:04 AM
PO171 Bank 1 fault on '05 Bonneville SE Walt Hanks 2000-2005 3 10-25-2010 06:49 PM
PO171, "Bank 1 lean?" Bob Dillon 1992-1999 9 01-27-2007 12:20 PM
"Lean Fuel Bank One - Help!" SOLVED San Juan Cruiser 2000-2005 67 06-08-2006 10:05 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:24 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.