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  1. #1

    Default 2003 Suburban "Reduced engine power"

    2003 Suburban with check engine light on and now says reduced engine power. Had code read a few days ago and it said "mixture too lean" on both banks. Tech said it could be MAF or O2 sensor but probably the MAF. I replaced this about a year ago and bought some cleaner and cleaned it. Light has remained on after approx 200 miles and the display just started saying reduced engine power.

    Does this sound like an O2 sensor problem? How hard are they to replace myself? Is it ok to drive with this message for a day?

    Thanks for the help,

  2. #2
    Jr. Engineer Gmcsuvguy's Avatar
    Join Date
    Dec 2007
    Alberta, Canada


    Maf sensor could still be bad, cleaning it may have been pointless. The odds of both O2 sensors going at once, without setting a O2 code are pretty slim. Dont drive it any longer than you have to...
    Ken Beida
    2010 GMC Sierra Crew Cab 4X4, 5.3L
    2009 GMC Sierra Denali, 6.2L = 403hp, AWD, Full load

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