Duplicate OBD-2 Codes
#1
Duplicate OBD-2 Codes
Hi - My "Service Engine Soon" light comes on from time to time. There is no rhyme or reason to when it's on and when it's not. Sometimes going over a bump will actually turn this light off. I have checked the codes and they are 12 (which I know is nothing to worry about) and 21 (O2 sensor - upstream or downstream from catalytic converter). The thing that I'm wondering is why do I sometimes get the 21 code three times? It started out as one 21 code then went to two of these codes and now three. I figured that maybe there would be one for upstream and one for downstream. Any ideas on this? Thanks.
#2
#4
RE: Duplicate OBD-2 Codes
According to Allpar, codes are not repeated http://www.allpar.com/fix/80s-codes.html
But my Neon flashes code 21 three times also
But my Neon flashes code 21 three times also