Originally posted by hiddendragonse:
today after 215 miles the light returned....the car runs flawlessly. Does anyone know what the mileage reset is for the test to pass ....some have said 15 miles and I have even heard 500 miles. If it resets in 15 miles can I take the test?
It takes a long time for the cat efficiency tests to run depending on your driving style. When I had the dreaded 420 and 430 codes, I cleared them with my laptop software and I then monitored when the test ran again. With mixed driving, it took about 3 weeks and 800 miles for the cat test to run again and hence lighting the CEL again.
Also remember the P0420 and P0430 are "pending" codes. I know of two people who have reset their PCM with the battery and the shop still found the codes as pending. I know with my software that you have the option of clearing both pending and "regular" error codes.
Last edited by Ed98.5SVT; 02/04/04 03:28 PM.
