Bernard, Terry, thanks for the confirmation, but how do the dealers read the error codes. I have the dreaded bogus "Slow Down" light problem. It only occurs after a "hot soak" i.e. driving and then leaving the car stopped/parked for anythng from 15 minutes to two hours. For the moment it has not shut the engine down, but it is getting more frequent. I've convinced myself it is the two ECUs, which are litterally cooked by the underbonnet temperature. I'm about to change the thermocouples and the two ECUs but I was hoping to read the error codes before doing this, rather than doing it on blind faith (in what has been posted by the gurus on this site). I would also like to be able to read error codes for the future.
'97 Rosso Corsa 550 Maranello