I own 1996 c200 (4 cyl.) Automatic. Car drove 130,000 Km and it's well kept.
Symptom: Recently I encountered a problem of engine does not start.

Usually when everything is OK when the key is in the switch at Position 1 the fuel pump makes a short noise (buzzing) while pumping for the initial start. Now when I have this problem of the engine is 'refusing' to start, this initial noise does not appear. My mechanic says it is the Ignition Module (part # 018 545 11 32) that manages the fuel pump, he 'fixed' it but the problem continues..

Today when it happened I disconnected the wiring from the module and reconnect it and everything got back to normal... what the heck should I do?!

could it be different problem?

tnx.

 

The code will lead you to the PMS ECU.

So the thing is that MB had a crappy wiring harness during 91-96. They called it 'Biodegradable' for environment reasons.. But they didn't realize it will biodegraded while still plugged o the vehicles.
I must be experiencing wiring connecting issues which affects the PMS..
This wiring harness is tons of money..