AAT ECU Wiring Diagram & Bosch Part Number Help

Translated on 02-09-2026, 21:03.

I hope someone can help me...

I need either a wiring diagram for an engine control unit (ECU) from an Audi 100 Avant 2.5 TDI manual transmission, manufactured in 1992, with Audi part number 4A0 907 401 (Bosch part number 0281 001 128).

Can anyone tell me which other control units are compatible? Would a control unit with the same Audi number but a different Bosch number work? For example, one with the ending "129"? What do these numbers indicate?

If anyone knows anything, please give me any information you have; I would be grateful for anything!

Thank you very much!

Translated on 02-09-2026, 21:05.

In all 4A0907401 datasets that I have, the value "129" appears. The newer STGs were...
If I recall correctly, it was also printed externally.
I think I still have two of these control units (which are essentially new; they were just in storage).
If you are interested, please send me a private message.

Best regards, Micha.