Quote:
Originally Posted by tbrown1985
the post cat o2 only measures the efficiency of the cat. won't effect anything other than passing emissions test. My M5 had this due to bad cats but I would just check the o2 connection/wiring and possibly change that sensor. better yet, swap the 2 post cat o2's and if the code moves to bank 1 then you know that's most likely the issue
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Man your the best, thank you will get it on, tomorrow.
*Thank's, appreciate your help*