On my 2003 Denali the CEL light went on today, then later starting idling rough, got home plugged in the code reader and im getting 4 codes for the 02 sensors? I cant really see all 4 sensors dead at the same time? Where do I start?
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03 Denali throwing all 4 u2 sensor codes
On my 2003 Denali the CEL light went on today, then later starting idling rough, got home plugged in the code reader and im getting 4 codes for the 02 sensors? I cant really see all 4 sensors dead at the same time? Where do I start?
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What are the codes for the o2 sensors that you are getting? Even though you are throwing codes, it doesn't mean that the o2 sensors are gone. I threw o2 codes because I was running lean....
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131 137 146 157
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Sorry 151 not 146
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there must be a common power circuit that is either broken or loose causing the codes, check for blown fuses in the engine bay.
Last edited by RickDaTuner; 10-09-2011 at 02:47 PM.
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Yeah they are all o2 sensor low circuit voltage
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I'd check the circuits leading to the sensors, ensure they have the reference voltage and grounds.
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i think this is one for the dealer i cant find an issue, but i did find a random ground wire that has fallen off from severe corossion, but i cant find where it came from? it was sitting on the drivers side bottom of the engine, kinda got melted from the exhaust..
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that would be the culprit...Originally posted by becks101
i think this is one for the dealer i cant find an issue, but i did find a random ground wire that has fallen off from severe corossion, but i cant find where it came from? it was sitting on the drivers side bottom of the engine, kinda got melted from the exhaust..
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6.0? sounds like your running lean, check fuel pressure and clean/replace MAF... sounds unrelated but try it
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