Interesting, as the car "seems" to be running ok.
One question though... is this a common problem with these computers? Do all 94 E420s run with their check light on? Have you replaced many of these?
The Service Bulletin I'm looking at is REF No.: MBNA 07.4/2 and it refers to these vehicles in the Jacksonville Region and then all other regions? Is this the one?
BTW... the original module part# is 016 545 13 32. The new one referred to in this TSB is 021 545 70 32.