[Toobad]

Unfortunately I picked the car up and about 5 miles later I've got the same message again...

Aaaargh! Talk about snatching defeat from the jaws of victory :crying: I wonder if they even bothered to do a road test after changing the valve and bellows. I hope you still managed to get your old caravan delivered and collect the new one. As Phil says, any Stealer in the UK (and probably Europe) will be happy to carry out warranty work for you. As they all act as agents for Mercedes-Benz, it is simply a matter of them claiming the money back.

 

[Toobad]

It certainly sounds like there's a lot of theatre going on to give the impression their CS should be "the best or nothing". I'm sure the experience of others allowed you to set your expectations sufficiently low so as not to be disappointed. Why don't you give that "spanner button" a press for no other reason than to entertain us by recounting the outcome. I'd wager the diagnostic information being transferred is no more than what you've already put in your signature on here but when you see the message appearing on your screen you can't help feeling impressed by the mental image of lederhosen-clad technicians with handlebar moustaches back in Stuttgart frantically analysing your car's data to provide you with a suitable answer.

 

[Toobad]

My best guess is that one of the sensors for the ABC has returned an out-of-range value the computer is not happy with. I don't think it is the actual compressor unit since that throws up the side profile of a saloon car when it goes awry. You could try pressing the "i" button up by the rear view mirror. That will connect you to the Help service who I believe have limited telematics available to them so may be able to pinpoint the fault. It is a lot more likely they will just tell you to contact your dealer who will book you in for a session on their Star diagnostics machine to read the fault codes. A software update will be the first plan of attack to see if the fault codes still persist. It is a rolling update so it will also correct other faults you probably didn't even know you had. As it is only an amber malfunction nothing bad is going to happen - until it does! :surprise: :wink2:
A deeper reset occurs after 4 hours of non-use. My COMAND screen went blank (no, I didn't accidentally hit the Standby button) then I was told speed limit recognition was no longer available and the dreaded amber Malfuction appeared on the dash without even an icon. A simple on/off reset wouldn't sort it but then it just came right overnight and hasn't done it again since.