Welcome,
Throttle actuators do fail (not often) & do require replacement.

Mounted on the intake manifold, takes approx 1.5-2 hrs to replace.

I would start by CLEANING the throttle actuator, using a "scotch-brite" pad I would scrub the inner housing & butterfly. Takes about 1/2 hour.

List price depends on the VIN of the car in question...MB list is APPROX $1500.


There are "remans" available for less that 1/2 of that MB list price.

__________________
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