2003 Suburban "Reduced engine power"

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by medicjack, Feb 12, 2010.

  1. medicjack

    medicjack New Member

    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. Gmcsuvguy

    Gmcsuvguy Rockstar 100 Posts

    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...

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