Generations

Engine Codes

 * http://www.audizine.com/forum/showthread.php/365283-Which-model-ECM-for-2004-allroad?p=5306106&viewfull=1#post5306106

Compatibility with A6 2.7ts

 * C5 A6 ecu's work on a S4 using a bench flasher in boot-mode to bypass the IMMO-EEPROM.

Compatibility with allroad 2.7ts
Full list here:

http://nyet.org/cars/files/stock/part-numbers.txt

North American Production numbers
2002 is build date of 06/01 to 07/01