Audi Replacement Key

When replacing a key for an Audi B8 (A4/A5/Q5 generation, ~2008–2016).  There are normally two common scenarios (adding a spare vs. all keys lost).
 
A — You have at least one working key (add a spare)

This is the easiest and cheapest route.

What is needed:

• VIN and proof of ownership (recommended to have on hand).
• An Original Working key

 
B — All keys lost

This is more complex because the car won’t authenticate any key — you must prove ownership and extract the immobilizer data to make a new key.

What is needed:

• VIN and proof of ownership (recommended to have on hand).
• Often ECU/BCM removal or module data reading is required.
• Or a Brand New key set from the Dealer (Expensive).

 
Cut the blade and program remote/transponder.
 
Module cloning / replacements — sometimes BCM2 or ECU replacement requires adaptation and possibly online authorization (component protection). This is more expensive and complex.