Any ideas where to find a comprehensive list of Merc Fault Codes ?
I’ve looked at a couple of sites , but they don’t seem to list the MR codes
If it still has it manual that comes with it in it they are in there. MR is a common one but I cant remember what it is! Exhaust brake or adblue cant remember.
Got a manual but it’s in german & not in words that give you a clue , such as exhaustenpuffensmoken ! 
Can the exhaust brake fault give symptoms like a brake disc being warped ?
Got the answer …MR1215 is turbo air intake temp incorrect. Found the fault air intake pipe cracked