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didn't u already start a few threads about RStuner ?
why not just wait for Henk to answer
As far as I know (from what I read on here and in the manual) some maps have cause cruise control not to work for a while but all was well after a few drives, and if it wasn't - Henk made another .cal file to fix it.
Never heard about the engine men. light coming on though.
Does it show any faults when you plug the device in?
I loaded 95RON map for my 197 and had no problems with it at all.
Revert back to the standard Map and see if the managment light goes off you know its caused by the map and if not you know its something else....Doesnt running the tuner in your car bring up all Fault Codes ??