Audi ECU Up for sale is a Working, in excellent condition Audi 90 v6 ECU. Audi part number 4A0 906 266AA (4A0906266AA), made by Hitachi. This will fit many V6 Audi models from the the late 80's early 90's. your best bet is to match the part numbers with the part you need. This is one of the most common no start or random stalling problems with these Hitachi ECU's. If yours does not have this problem, keep an extra ECU in the trunk, you might some day be glad you did... These units now have to be special ordered from most dealers new for big $$ (often times over $1000!), and finding a good one second hand is getting to be a very hard chore.