a friend of mine recently buy a 1996 e420 and suddenly on the road stop she get the car to the dealer and the mechanics say that she need to replace the engine control unit and the infrared control unit but the are charging about $4000

and she don't have that amount of money please guys help me out i find on eBay a ecu for e420 1997 that will fit ??? and no luck whit the infrared
some info about the car
thanks
VIN WDB2100721A105011
Plant 50
Model E420
Chassis 2100721A105011
Engine 119985 02 000935
Transmission 722625 00 020913
Tyres
Primary PIRELLI
Order 0 6 723 10024
Heating 0574710029
Lights HELLA
Cab 00000
Delivery date 13.06.96