You will require a deactivation kit from vw.There will be a document that requires filling out so the dvla are notified of deactivation and then its just a case of deselecting the airbag via diagnostic equipment,some systems require a resistor to be installed to the airbag connector to completely disarm the airbag.Also there will be a sticker in the kit to place on the dash to indicate the airbag is deactivated and the airbag light will flash for a 10 seconds when you start the car to warn the driver.