O2 sensor..

[GryWgn]

hi i have a question about the 02 sensor in the vu ute LS1, I have difillipo extractors and high flow cats, my 02 sensors are b4 the cats... My question is: My engine light is on, the is no error codes showing in the dash error checker, it back crackles really loud pretty much backfires but it seems to drive ok im not sure if i need to replace them or not ??? ??? i have pulled them out and are black as shit also..........

[ryan101]

i have heard sumtimes this happens when you get new exctractors, it the oily coating inside the new pipes it will burn off in a few weeks, then go out and buy new o2 seners and replace them

[WogBoyz]

hi i have a question about the 02 sensor in the vu ute LS1, I have difillipo extractors and high flow cats, my 02 sensors are b4 the cats... My question is: My engine light is on, the is no error codes showing in the dash error checker, it back crackles really loud pretty much backfires but it seems to drive ok im not sure if i need to replace them or not ??? ??? i have pulled them out and are black as shit also..........

That black shit is soot from your engine running to rich i believe, not sure about vu but on ve when we get headers it trips the engine light and a tune is required to get rid of it, may be the same case with you