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2005 Chevy Silverado O2 sensor

I have replaced all four O2 sensors with OEM parts but the codes still say they are failing. Is there a fuse that coul be blown. If so where is it. If not what else could be the problem

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  • Anonymous May 13, 2009

    I have the same problem. All 4 O2 sensors say they are bad, so I checked the (15 amp) fuse under the hood on drivers side. It shows to be good also. Is there another relay/fuse that would control all the sensors or is there a wiring issue somewhere?

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I 1st need to know the codes, the O2 heaters are fused, but without the codes don't know, check the fuse box for the O2 heater fuse, if it is not blown I will try to make out what is wrong from the codes

Posted on Oct 16, 2008

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