It's been a while since I've done it, but after you've checked the codes, wait at least two seconds, then hold the button down for six seconds. Each code must be erased individually.

If you still have a check engine light, then you either have a new code, or you still have an old code that you didn't erase.

I saw your earlier post with all of the various fault codes. You had so many that I couldn't offer any advice.

My guess is that some of the codes could be old, i.e. when a part was replaced or disconected, it sometimes stores a code.

You should also know that when you have one particular problem, it frequently sets off other codes. The problem is knowing which codes are real (germaine to your problem), and which codes are ancillary.

I'm nearly 100% confindent that you do have a problem, otherwise code(s) wouldn't have been stored, and your check engine light wouldn't have illuminated.

You should also be aware that there are 26 individual systems that will cause a check engine light to be illuminated. Your diagnostic module stores many codes, but only the 26 codes, all of them related to smog emissions, will trip a check engine light.

Very common codes on your engine (and mine) are related to the O2 sensor, the EGR system, and the transmission upshift delay valve.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".