Mercedes Benz MAS / control unit Up for sale is a used MAS / Chassis Control module control unit. This performs a variety of different functions, from emissions control, dash lights, switches, resistance checks for faults, to turning on the fuel pump... This is a very expensive bit, around $4000 from M-B. Yes, it's that expensive.... Tested & functional. This unit should offer many more years of dependable service. Part number 0 261 200 924 // 018 545 09 32 This fits many 1994+ Mercedes W202 cars ( c220 C280 C230 ), and probably more. Check the part number off of your original.