Question about 2004 GMC Sierra 1500 Crew Cab

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Ihave a 2004 GMC Sierra pickup. My check engine is on, i had it checked at auto zone and they said it was the 02 sensor with low voltage. I have already replaced all the sensors and catylact converters. And still the light comes on.

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  • GMC Master
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Did you check the wiring connections for corrosion? Clean them up with some sandpaper so you have bare shiny metal. Do the terminals come off easily or move side to side? Crimp them with a pair of pliers to tighten them up and put them back on. Did you examine the wire harness going to the O2 sensor to check for bare spots in the insulation? Tape up any suspicious spots that appear to have been rubbing and pay close attention to spots where the harness bends. Any of these could reduce the voltage at the sensor . Hope this helps.

Posted on Sep 09, 2010

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2004 gmc sierra


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