If only the ASR lamp comes on then the problem is usually in the throttle actuator! Most all of the 1992 cars had this problem. The 500E had SI(bulletin) on this subject. Had to replace t/actuator & re-route wiring across valve cover. What computers did they scan?? EA & ASR

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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