I have a four year old 407, recently replaced rear O/side tyre inflation Valve. MFD flags up low tyre pressure on R/H O/S. How do I reset system
I would guess you need a service light reset/code reader/diagnostic reader that reads the latest OBDII CAN fault codes etc.
There's loads of good quality readers and diagnostic reset tools advertised online and in many car magazines. Try Car Mechanics Magazine as they often test such devices on actual cars that are being worked on.
Worth the investment as more and more cars management systems need to be told when new components have been fitted. Some makes even need reset tools just to get the brake calipers to retract the pistons.
Apart from that, I don't know of any short cuts that would reset the tyre warning lamp.