Hello and welcome, congratulations on your new car

This is a red light in the dial unit? If so it is meant to come up for a few seconds when you start the engine then go off again. If it's coming on while driving it can signify a problem with the engine. Are you noticing any changes to performance or noise? The most common first suggestion is to run some Redex injector cleaner through with your petrol for a few tankfuls and if this doesn't help and there are no further clues, get it plugged in for a diagnostic at your local garage. As you have recently bought it, check the service history and if it's due one, look into that as well.