One must ask ones self what does by-pass mean. Then one must find what an OVP does. AND, then it becomes obvious.

The OVP is simply a fuse like any other fuse except it is designed to blow on voltage changes not current changes.

It's most basic purpose is to connect various control units to the battery.

Based upon that concept what determination can be made of the case Stephen points out? That case being that a new OVP made the car run worse.

Its most likely that the old unit was bad. Think about it and tell me how I can be right. Unless you understand why I can be right you are not understanding how things work. I'm going to let someone else explain it. This is a challenge! All you techs take a break.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician