If it was serviced by a Fiat garage,they would have re-set it.It seems it was done by an indie.,very few of which have the necessary (Fiat specific) re-set tool. You can take it to a Fiat dealer,who will re-set it for a fee,or you can simply ignore it. It will extinguish eventually. Being the cynic I am, I always check that the service has been done by checking the sump oil,filters etc. Thankfully my present Fiat garage is excellent.They seem to be weeding out the poor ones--and not before time.