Quote:
Originally Posted by white_knight
So I was driving around with a CEL for a couple of weeks.
I hooked up an OBD and found it was a P0420, which I then cleared, as I had this same issue around 12 months ago (I had the dealer replace the 02 sensor).
Immediately after I cleared it, I found the car became extremely sluggish at low revs, almost limp (it was fine when the CEL was on!).
For the record, I have the SpeedFactory UEL catted headers with a custom ECUTEK tune.
Thoughts?
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Even catted headers will not guarantee ecu will not throw P0420 cat efficiency cel code as the ecu is looking for the readings of the stock cat, if the aftermarket cat does not give same reading it will trigger cel.
Get your tuner to disable P0420 in tune.
When you reset CEL codes you reset ECU, learned parameters like fuel trims, throttle initial calibration are cleared, you will likely get the "dead" feeling throttle for first couple of drive cycles.
Cycle the ignition 2 or three times 30 sec intervals without touching the throttle.
Then do 2 or 3 very light throttle runs from 2000-5000 rpm 2nd gear should be sorted.
have a read of the Flashing Reset Learning link below