View Single Post
Old 11-06-2001, 08:01 AM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Use the search mechanism. OVP is probably the single most talked about problem since I have been here.

The device is basically a surge protector for various important/expensive control units. It uses a zener diode to short all voltage over a set point to ground through the fuse.

Jump starting with a battery charger or other high voltage methods takes out the fuse. Alternator/regulator problems can take out the fuse/fuses. But, most problems are actually just defective electronics or circuits within the device. On a wide group of 201/126/124 cars the simultaneous incidence of cold start problems and ABS light are a good clue. I have had units that would power one and not the other controller though and I have seen enough intermittant internal connections to waste weeks searching.

I now replace any OVP with original date code if the car has any stalling or cold starting problems.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote