How to Remove the OVP Relay in a Mercedes

Written by kyle sanstrom
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The over-voltage protection (OVP) relay in a Mercedes is designed to protect the vehicle's electrical systems, such as the anti-lock braking system, in the event of a voltage surge. This relay is mounted inside a small plastic container situated behind the vehicle's battery. It is easily identifiable by the 10-amp fuse mounted under a clear plastic cover on top of the relay. Replacement OVP relays are available from certified Mercedes-Benz parts resellers.

Skill level:


  1. 1

    Drive the car onto a flat surface and shift the transmission into park. Turn off the engine and depress the parking brake pedal. Pop open the bonnet.

  2. 2

    Locate the OVP relay box. It is made from black plastic and is located directly behind the vehicle's battery.

  3. 3

    Remove the cover from the OVP relay box and pop open the clear plastic cover holding the 10-amp fuse to the relay. Remove the fuse from the relay. Remove the relay from the relay box.

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