GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 2 of 2
  1. #1

    Default 2007 Envoy Intermittent Code PO 171

    Need Help; Engine service light (code PO 171) system running lean left bank. This light comes on and then goes off after a few restart cycles. dealer has replaced, Oxy sensor, MAF sensor, dropped the fuel tank to check for trash. We may drive car for several miles before light comes back on. Dealer can not or has not found problem because it is a intermittent problem and has not done it while he has Envoy. Problem occurs and goes away but has set code. Envoy will not pass inspection with the code set. PLEASE COMMENT ON THIS PROBLEM IF YOU HAVE ANY SUGGESTIONS. THANKS

  2. #2


    Could also be a dirty or clogged fuel injector, bad PCV valve or something as simple as a vacuum leak in the hoses or intake manifold, I would hope the dealer would've checked these things already though.

Similar Threads

  1. 2007 intermittent start
    By foxfire58 in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 0
    Last: 01-04-2013, 12:24 PM
  2. Recurring CEL Evap Error code 2007 Silverado
    By MoBillyAla in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 01-01-2013, 09:31 AM
  3. 2005 2006 2007 2008 2009 envoy keyless entry remote fob
    By ChevyFan in forum Chevy Keyless Entry Remotes
    Replies: 0
    Last: 05-27-2011, 03:40 PM
  4. 2007 Envoy Denali stereo install
    By MannyO in forum Audio, Video & Gadget Tech
    Replies: 1
    Last: 01-21-2009, 01:09 AM
  5. Spy Shots: 2007 GMC Envoy - Line
    By ChevyFan in forum Chevy Trailblazer Forum (GMC Envoy)
    Replies: 0
    Last: 01-25-2008, 07:50 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts