Code 12 and 21 help
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Joined: Apr 2009
Posts: 86
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From: Tampa, Fl
Code 12 and 21 help
Ok so i know what 12 and 21 are they're loss of standby power which i dont understand AT ALL! and 21 is for o2 but my question is. Is that meaning it is bad needs to be replaced or its readin lean or rich? Damn obd1
code 12 means that the battery has been disconnected within the last 50 key-on cycles. its meaningless. your right about code 21. replace the o2 sensors and you should be good
