Originally posted by Mike:
If you are chipped, do you still need to run the MIL's. My CEL is on all the time but the car runs awesome. I think the CEL is from the chip. But back to the orig question. Do you need to run MIL's if you have a chip.
Yes.
The CEL comes on because the second series of O2 sensors does not read a change in A/F compared to the first series and throws a Cat Efficiency Code.
A chip will not affect this in any way.
