Ok, I have decided to change the OVP. The relay looks old,
probably a factory one.
The part number on top of it is 201-540-32-45 What is the replacement part number?

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1989 230E, 8v, 166.000 km, updated to 94/95 trunk & hood
2002 Daewoo Nexia 50.000 km
Sold:
1987 VW Jetta GLE 16V, Recaro seats
1982 Volvo 240 DL (lovely car!)
and few more american cars.