Mercedes ECU Up for sale is a Working, in excellent condition Mercedes Control unit module. Part numbers listed at the top. This ECU came out of a 96 SL500. May fit even more models/years, but as always your best bet is to match the part number to the one on your ECU. A faulty ECU is one of the most common no start or random stalling problems with these cars. These can also cause issues with erroneous check engine lights, idle control problems as well as emission control & cold or hot start problems. I have also seen fuel pump relay turn on faults (ECU won't turn on the fuel pump), as well as an condition where the high speed injector driver has failed. This causes the car to sit and idle fine, but it won't accelerate.list price is OVER $4500! Not here... This comes with a 30 day functionality guarantee.