Differences in MSG for Audi 2.5 TDI AAT engines

Hopefully, someone can help me.

I have an Audi 100 2.5 TDI with engine code AAT and manufactured in 1993.

This one has a message with the label:

Bosch.
0 265 100 056

Probably the serial number is located in the white box.
366 11924

VW/Audi Part No. 4A0 907 379A

"From my accident car with the same engine code (MKB) but manufactured in 1991, I have an ECU (engine control unit) with the following label:"

Bosch.
0 265 100 037

Probably the serial number is located in the white box.
262 03865

VW/Audi Part Number: 443 907 379 C


I want to have the MSG (engine control unit) from a 1991 Audi chipped and then install it in my current car.
The question is whether the control units are the same and if everything will work .

According to the default data table in the FAQ, both control units are version 1.

The 1991 Audi didn't have an airbag, unlike my current car.
Could it be that in older control units, the airbag control unit is integrated into the main system module (MSG)?

It would be really helpful if someone could assist me or take a look at this.

Best regards,

Markus.

Um... what you found there isn't the engine control unit, but it's...
from the ABS.
A friend has some AAT MSTGs available. If you are interested, please send me a private message .

Best regards,
Rudi

Hehe
If I remember correctly, the engine control unit (ECU) in an Audi 100 is not located in the engine compartment. You'll need a carpet knife.

Best regards, Rainer.

Yep.
The MSTG is located on the passenger side (footwell) behind the carpet.
Number: 4A0 907 401

Awkwardly awkward...

The amazing thing was under the back seat.
Let's look at them one by one.

Thank you for the very helpful and quick tips .

But why are the ABS control units different from each other?
Has anything significant happened recently?
If someone is interested, they can purchase the item.

Best regards,

Markus.

It likely uses more advanced and integrated technology, which saves the manufacturer money and storage space.