Audi Repair Questions? Ask a Mechanic for Answers ASAP
This unit can only be replaced as a complete unit. There are no user changable parts available. Unfortunatly being Audi they are extremely expensive! You may find a second hand unit available in a breakers yard from an accident damaged vehicle but other than this there isn't much option other than to have a new one.
There will either be a label on the unit with the part number or it will be etched onto the part somewhere. Usually a 9 character code for VAG part numbers.
Often units do need codeing to the vehicle with all VAG vehicles. Being in efect a switch unit I don't think it will require coding