Quote:
Originally Posted by GTM_Challenge
We have about 15-20 HFC downpipes out there with no CEL. I have only seen once customer so far that has had it pop up. It would only come on every once any awhile though. Unfortunately BMW changes software versions often and sometimes changes O2 sensor sensitivity so we can never guarantee no CEL but so far its looking good
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I was the guy who would get CEL light, but it only seemed to happen when I put in 100 Octane.
Also, it wouldn't always be up. Was more sporadic than anything, and seemed to reset and turn off on its own. But then, when I would put in a new batch of 100 octane, it would pop up.
JB4 stage 2 eliminated the CEL completely.
Also, I am completely satisfied with my Challenge HFC DP. Sounds great, and hauls ass. Just my 2 cents.
