The check engine light has come on in my 1994 E320 and the cause is a faulty Upshift Delay Switch Over Valve. I have three
questions.
1. The car runs fine with no other problems. I understand that this has something to do with heating the catalytic converter in cold weather. Is this something that needs to be fixed or can I
just ignore it?
2. If it is a must fix, about how much will it cost to fix it?
3. If it is not a must fix, is there some way to turn off the check engine light?
Thank You, Bill Scott