druhanson55 Posted January 12, 2007 Share Posted January 12, 2007 :chairshot:I can't get the light to go off and code 21, (Main O2 sensor signal (left)) won't clear. I pulled the fuse with no luck and pulled the -battery cable overnight. When reconnecting the battery cable the cel light is still on and code 21 is still present. I don't understand how the code can show up again before running the engine?? Does this suggest that I have a short in the O2 sensor circuit? The car runs fine but I need to get this cleared so I can get my inspection sticker. All help is greatly appreciated !!! Quote Link to comment Share on other sites More sharing options...
Lambo Travis Posted February 24, 2007 Share Posted February 24, 2007 :chairshot:I can't get the light to go off and code 21, (Main O2 sensor signal (left)) won't clear. I pulled the fuse with no luck and pulled the -battery cable overnight. When reconnecting the battery cable the cel light is still on and code 21 is still present. I don't understand how the code can show up again before running the engine?? Does this suggest that I have a short in the O2 sensor circuit? The car runs fine but I need to get this cleared so I can get my inspection sticker. All help is greatly appreciated !!! (bump) I too have the code 21 - haven't replaced anything yet, tho - just hadda buncha other things done (timing belt, water pump, rotors, etc...) & CEL is still on w/21 showing - also - "TRAC-OFF" stays on - I read in another post that it will stay on as long as CEL is on, possibly even if there is no trac prob - I'm DEFINITELY no mechanic, so sorry in advance if I worded this "stupid" - thanx for help/advice - ~T~ Quote Link to comment Share on other sites More sharing options...
SKperformance Posted February 25, 2007 Share Posted February 25, 2007 I would check to make sure the wire is not melted. Quote Link to comment Share on other sites More sharing options...
bicol-ini Posted February 25, 2007 Share Posted February 25, 2007 then you replace the O2 sensor? if you then check on wiring, maybe some loose in there Quote Link to comment Share on other sites More sharing options...
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