The 1990 & later cars have a "blue" plastic cam between the ignition switch & the steering lock! That cam must be installed properly & the cable connected fot the shifter to move from park!

IF you are sure of that? possibly the shift interlock cable needs adjusting at the shifter!

__________________
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)
Retired Moderator