Hi all ive got a bit of a strange cel problem with my 2002 prodrive sti.
The cel comes on and stays lit. when i do a code check it comes up random missfire codes p0302 p0301 also had a couple different codes relating to airleaks.
anyway checked plugs and regapped i havent changed the coils yet but i did put a new 1 on when the code first showed on cylinder 2 but it didnt sort it.
The cel is not flashing and the code goes straight to historic code it comes on even when the car is just at idle.
The car dosent go into limp mode and drives perfectly even with the cel lit.
It does feel lumpy at idle but fine if revs raised.
I have read many threads about the nps but the symptons dont sound like mine.
Does anyone have any idea what it may be?

 

Bump any suggestions please ?