How to reset a Ford mondeo mk3 ECU ?

Listen to Evelyn the Modified Dog who knows more than most about cars. Assuming your car has an ecu with the 'drivers habit' learning ability [and i am a bit sceptical that an 02 Mondeo has] it is NOT a one shot thing. Change drivers and within a fairly short time it will adapt to the different usage habits. Just leave it to learn your habits, start fiddling and losing the radio may be the least of your worries!