CDK and rayc many thanks for you help. my information is from a old neighbour who managed to have a heart attack last sunday so until he gets better Im still asking questions.Garages and I do not get on,to that end I do nearly all my own work, and always use genuine Fiat spares.Yes limp mode is an assumption but my owner hand book 2014 page 25/26 says Engine performance will decrease if driving is continued in these conditions, ie failure to reset the scheduled service plan.Again many thanks and if anything comes to mind please let me know. kind regards bill