Hopefully i can help..
How far are you hoping to use the car?
How does the engine,transmission if auto - perform wise since this fault occurred,any missfiring or unusual noises from the engine etc?
Has this been an ongoing issue?
Any other warnings on apart from the emergancy mode
Hi..there thanks for your reply..
Ok as you already know or be aware the emergancy mode will generally be the cars main computer ecu telling you that issue has been detected with one of the engine sensors become faulty or is running out of normal parameters or ecu controlled,monitored components,electronics side on the engine itself,it also possible to cover fault with the gearbox itself and electronics side.this will usually put the vehicle into whats termed as limp home mode feature which reduced the cars power to certain rpm,reduced speed...although its possible to continue driving with reduced engine power as that what it desgined for to get a garage to enable fault diagnoses retrival via a suitable diagnostic machine..before you can progress further as per checks or replacing parts even..If the car seems to pull well and run fine as it has been before this warning flagged up then it should be fine as long as you do have some sort of back up as per breakdown cover then you should be fine...Usually with any sort of fault like this that does flag its is always advised to find out exactly what the ecu is seeing as faulty and wither it serious or not in particular if you have to do a long journey back so to speak - that could be something to certainly consider if where you are you know of a mercedes dealership.or local garage near by that can scan the vehicle for you wither as per what faults codes are retrived is safe to continue or basically have the vehicle repaired there or recovered back to UK..if you can maybe have a quick careful check under the bonnet and look around the engine checking pretty much everything electrical plug wise/hose lines etc and ensure none have slipped of or ruptured etc checking for leaks too...