Thanks to all for your help on my OPV relay problem. I would strongly suggest if you have the orignial Siemens part #000 540 52 45 in your vehicle - replace it. It's cheep and easy to do.
I removed the battery to gain better access to the Relay. After you have removed the one retaining bolt, the relay just pulls straight off of the connector, there are not any clips etc to remove or disconnect. Take your time and wiggle the OPV from the connector.
I wish I would have done it sooner.
I wonder what other problems are probable for a 1994 E320? I recently did the Tumbler, I know about the head gasket, wiring and mount issues.