OVP - wiring diag.
 

190E 2.3 16v, 1988 - I have the Mercedes workshop manual for the wiring diagrams for the W124,201 but can't find a diagram for the 9 pin OVP plug on the 16V. Not sure if the Diakom.ru diags (engine compartment cont. grids 8-11)are accurate as I am missing a red wire from pin 4 and only 8 of the 9 shown. Any help appreciated.

Do you think someone stole it?

Did you consider the possibility that only 8 out of 9 pins are used?

Is there a problem with the car?

Found the relevant diagram and answered my question. All the pins on OVP relay/plug are used, I was checking the connections as the ABS light stays on after start up . As the car is stationary I believe the problem is with the OVP rather than sensors.