the owners manual for my 1990 2.0l lists the circuits powerd by fuse 12(8 amp white)as
1-rear dome light
2-auto antenna-radio
3-relay window lift terminal 86
4-central locking system
5-seat adjustment memory
6-seat adjustment relay terminal 86
it also includes the power feed to the radio but this is shown as fuse 19 in the haynes manual.
Premium. Always.
firing order is1432
test
This is a job for a quailified repair specialist not for a DIYer.
If you have a 1989 or a 1990 2.6 Liter automantic transmission Mercedes Benz,then there is no PCV. It has already passed emissions.
call the dealership give the vin #,and they will give you the radio code
Contact a Mercedes dealer. Febi/bilstein Part# 08972 comes in 1 liter bottles. The power steering capacity is 0.6 liters(0.6US qt)for a 1990 190E 2.6
You might try 33343. It is the one I use for my 1991 model
It is under the transmisson. the wat to check the level is by the dip stck with the red cap just behind the last spark plud
As per page 95 of the owners manual The electrode gap is 0.8 mm (0.032 in)
Check your battery connections. If the terminals are good then check the starter.
If Its Like the 1990 model, it doesn't have one. Simply open the car, and press the front end of the gas cover towards the front. That should do it.