93 mercedes 300te no start intermittent
 

I am working on a 93 300te that intermittently is hard to start. it cranks fine but is either not getting spark or fuel. it has a code 12 inthe sysytem but I lack a 93 manual to tell me what the code is.
we here a buzzing noisefrom about the air inlet and it will start, if no buzzing noise car will not start.we tap on top and it will start.
Any help would be appreciated.

Code 12 should be open or short circuit lamdba sensor heater. this would not stop the car from starting.

Fuel pump relay is a likely culprit for intermittent non starting.

OVP relay , [aluminum rectangular can behind the panel, rear of battery]... tap that one ... on HFM/SFI 104 cars, that causes No spark/No fuel} as it powers ECU
There has been a part change on these .. if the old was made by Siemens. Austria, change it....

93 mercedes 300te wont start
 

I am looking for the updated part numger for the ovp relay . according to the dealer this part has not been updated and the part number given to me is 0005406745 appreciate your help

Re: 93 mercedes 300te wont start
 

That is the new #
the original was 000 540 52 45

Pull the one in there and see if has already been changed [ most likely, as all the orig 52 45 crapped by now]

new / updated OVP for W124
 

Just replaced the OVP on my 93 300CE coupe:
- original part #: 000 540 52 45
- replacement part #: 000 540 67 45

They look very similar, although the (blue 15A) fuse is oriented differently on the new part.