Mercedes ECU 

Up for sale is a Working, in excellent condition Mercedes Engine / lambda Control Unit. Mercedes Part number-- 0 280 800 038  / 002 545 00 32  . This unit is out of a 84 380SE (w126 chassis). 

A faulty ECU can cause a whole hots of issues with these cars, including non running, and random cutting out (but usually it will re-start moments later). Also idle control & emission issues are possible (excess smoke or overheating caused by lean running). Hot or cold start issues can be caused as well. These units are no longer available almost everywhere and VERY hard to find used.

Your best bet is to check the part number of the ECU you are trying to replace with this items part number to make sure they are the same. Price this from Mercedes, they are over $2600 for one. Ouch, not here.