Tammie33

Is there another way around changing the SBC Unit into an AB S on my E 500

TommiM

Its not impossible but in the end it would cost more, way more, than to just have it replaced. FIrst you would have to purchase the esp control unit from a 2007 later W211, then you would likely have to swap mesfi control unit and transmision control unit and somehow version code all this to your new vehicle. And thats even if its possible to be done with dealer sds without having MBUSA involved with the retrofitted coding since your essentially deleting a safety feature that Mercedes put in the car. You would likely have to sign something Im sure, as Mercedes is really strict with stuff like this.
SBC pumps have a 10 year warranty fyi.