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  1. #1

    Default 98 suburban Code po140

    Got the check engine light with code PO140 when scanned. I've heard several different items it could be and would rather get advice on a simple order to check or replace things.

    Ive vey reset the code twice and it comes back. I just did again to see how long before light comes back.

    Any advice would be greatly appreciated.

  2. #2
    Jr. Mechanic
    Join Date
    Nov 2011
    Location
    Central Illinois
    Posts
    129

    Default

    Most likely a bad O2 sensor. This site has the best explanation and troubleshooting info. http://www.obd-codes.com/p0140
    2012 Silverado 1500 LT 4X4
    2003 Suburban LT 2500 6.0L
    2004 2500HD Crew Cab LT 4x4 6.0L - SOLD

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