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[Doctor Gollum]

Obviously the above approach didn't work 

Enquired of a couple of indys £100-130 for an hours scan with no guarantee of a result. Mercedes kindly offered to do it for £192 plus extra programming time

Found a small indy so popped in and £40 later all was well

Turns out, that when the previous second hand EIS/key were fitted from an S500, they had recoded the engine to a V8 in the chassis data and had neglected to update the build data in the process.

Net result was that because the EIS had previously been coded to a car with Distronic, (semi autonomous cruise control) it expected to see that on my car, but because it couldn't, it threw up the communication codes. Normarily, the units I swapped out would have sufficed, but for a check box when the unit had previously been changed.

Chassis has now been updated with the correct engine codes for the engine ecu etc.

So all done... cruise works, ESP works and no lights/malfunctions showing. Which is nice

[terry paget]

Gosh, what a battle! Well done, Doc, you got there in the end, aided by a small Indy.

[Broomies Mate]

Forty quid is a small price to pay for having something that works as intended.

Good job!