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what is code 51?

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92cb7sk8er

10+ Year Contributor
46
0
Feb 28, 2011
lima, Ohio
Alright I know that code 51 has to do with the o2 sensor now my ? Here is what one is it I'm guessing its the upper one but I would rather like to know then to guess LOL so thanks for any help guys :)
 
oh?? i got a book on the car and it said o2 sensor??? :confused:

i looked at that pg and it was for ABS codes
 
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