Check Engine Light returns?
My 92 500E continues to trigger the check engine light.
As best I can remember the diagnostic codes are
-crankshaft position sensor open or short circuit
-right upshift delay switchover valve open or short circuit
The car still runs perfect. Each time we clear the fault codes, the problem returns. Sometimes it takes weeks, Sometimes it takes only 2 days.
The car is box stock except for K&N's, slotted rotors, and a modification to the tranny, the valve body was modified to improve first gear starts. It was done by a local tranny shop who does a lot of MB tranny work but I am not certain exactly what was done. It does kick down a little sooner but the change is not radical as the car often does not start in first gear. As the tranny was out of the car for other reasons, the modification was not very expensive.