Quote:
Originally Posted by DrVenture
I know a guy with catless DP and tune, who is a darn good mechanic and well-informed, he puts his original DP back on every three years for OBDII. The problem is that the O2 sensors will never report "ready" state, if the CEL is turned off in a tune.
High flows will get you to ready state, as the O2s exist. Whether they indicate efficiency, or throw CELs at random times, I don't know. Might get you past the test though.
My guess is you need both catted DPs and a tune that acknowledges the existence of O2 sensors.
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****This has been my experience here in Maryland where we have emissions and a visual. They used spacers of some sort on the O2 sensors in addition to a tune that recognizes the O2 Sensors. I have had no CEL lights at all since the DP change with high flow cats.
I was told the O2 spacers would have to be replaced at some point if the car was driven enough. I've been good for some time now but don't really drive all that much. The spacers are inexpensive and easy enough to install.
I'm just happy to not have the CEL quite honestly. Have had other cars that were nightmares to get past our emissions standards here.