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wifes truck is drivin my nuts

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ok heres the deal we gotta 2004 trail blazer ls with the 4.2 liter and it has 32,350 on it. we bought it used in Jan 2006 when it only had 21,200 on it. my wife has always wanted one.

we had the truck 10 months and the check engine light came biggie just an O2 sensor(upstream).dealership replaced. light out.

now, fast forward to june 27 2008.....check engine light on...O2 sensor (downstream). i replaced and light goes out.

july 3 2008 check engine light on...O2 sensor (upstream). i replaced and light goes out

currently the light has come back on after a day and a half.
and the codes read as O2 sensors

see why its drivin me nuts.???
any advice please send to me asap


thanks a million


  1. ChevyFan's Avatar
    Bad O2 sensor wiring causing them to fry? There are some circumstances when you can fry them out quickly, running too rich or something like that, I totally fortget. Anyone?
  2. CarpenterGuy's Avatar
    Yeah, check your wiring.

    It's too rich
  3. trimhalifax's Avatar
    I replaced 4 on my silverado, wiring was rerouted away from exhaust and no problems since