Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi Rick, at this point it can be either the valve or the control unit. I would try a new valve first.
You are going to have to shop for a used on in the salvage yards or on ebay. The part number is ***** 141 12 25. If you do a search on ebay you will find them for around $350. A new one is $1250 if they are still available.