ok. So I had a few codes being thrown. 21,28,55, and one more that was some temp sensor. I replaced both top O2 sensors and reset the CEL. Started the car no CEL, I ran it down the street and it came on. I noticed that when I start the car after sitting few an hour or so the light is off. if i rev it passed 2K it comes on and stays on. The car runs fine. It makes a little rattling noise under hard acceleration but it sounds like it is coming from around the tranny. Sounds like a piece of tin vibrating. But I don't think that has anything to do with it.

I have read that the only way to clear the light is to replace the PCM? is this right?

If I keep driving the car is it going to mess anything up. I have driven about 4K miles so far and then changed the O2's out. It dose seem to have improved and smells a lot better lol.

Do I need to replace the knock sensors?


thanks to all.
-jason


P.S. I did search and got nothing. I searched "code 55"

 

So I guess no one knows.

well anyone know if, the CEL is on do to this does it put the ECU into "limp mode" cutting back the performance and basically pouring gas into the cylinders?