FIRST try turning car on-off 10 or 20 times, without trying to start. Possibly the ignition switch will allow the starter to operate.
The electrical portion of the ignition switch requires a special tool to remove the key tumbler.
The part number is 210-460-02-97 & has a list of $75.
should take 1 to 2 hrs to replace.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)