Don't think my W210 has an OVP - more distributed architecture.

However, my W126 diesel does and I scewed around with it for a year before I final took it apart, cleaned and smoothed the contacts, and resoldered a point or two - then all OK.

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg