how do I get the code stereo of renault scenic

remove stereo and on the side of the unit will be a barcode, beneath the bar code ther will be a security number which ends with 1 letter and 3 digits ie t345, go to your local renault dealer who can apply for this which will obviously be chargeable or take the unit to a car hifi shop who can reprogram the unit with a new number.
Cheers
Hope this helps
ps there is also a facility available on ebay where you supply number and chassis number and the code is supplied.