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Originally Posted by mweisdorfer
Do you have a check engine light?
If not, I would not worry about it. The post cat only monitor the pre-cat's.
The pre-cats are what typically go bad after 100k-110k or so.
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The errors have produced a check engine light. They all pointed to bank 1 post cat. I've cleared them and driven kinda hard in attempts to burn out crap. I just had a walnut blast, valve cover gasket, rear turbo charge pipe replacement, oil change, HPFP, all 6 injectors and the God damn cabin filter done at my local dealership. So to now see several codes popping up for the same sensor out of 4.......I'm pissed they didn't do or even recommend it. How do you drive 5 miles and get code after code after spending 6 grand? Hence my diligence asking folks before just replacing 2 at a time. I wanna know how everyone else's behave at idle. INPA/WHATSAPP/SSS and several more tell you. Plus....your wrong in what you said. The O2 sensors do factor in on Air/Fuel mix. So a bullshit result on the rears will make the DME compensate fuel trim. Most definitely this will produce a sluggish whip brah!