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Old 06-04-2001, 02:00 PM
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G-Benz G-Benz is offline
Razorback Soccer Dad
Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Ah yes the OVP. Stands for Over Voltage Protection relay. It's main function is to shunt the circuit whenever it senses a input voltage that is greater than nominal. Protects the sensitive computer circuitry.

Before you ask, it's located behind the battery. There is a black plastic shroud that you can just push forward and lift out of the way, which will reveal a few electrical components. The OVP is a silver rectangular unit with a clear plastic top, covering one or two red (or green) fuses inside, depending on your model year.

I replaced mine in my 300E a few months ago after getting some intermittent starting problems, and that cured it.

I have read threads where the OVP was the source of anything from starting problems to ABS light coming on.

Anyway, I am hardly an expert when it comes to this stuff, I can just share from experience. But if you do a search on "OVP", you should find a ton of information about it.

2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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