Hemisoft/Joerg and Bastelfix: thank you both for replying in English - much appreciated!
You're correct, I'm referring to "ESP: Elektronische Stabilitätsprogramm", and I've contacted a BMW tuner that says its possible to code a Bosch 5.3 correctly. I'll remove the Bosch 5.3 ESP as a last resort because I'm not sure which ABS-only brake controller to fit instead of the Bosch 5.3.
Challenges:
Right now the T4 is setup as an automatic - so I need pedals and a gear shifter (not sure where to get either).
I need to find someone willing to install these parts
I need to find an 02G transmission and associated parts - in the US it costs about $5000 or about EUR4300, and they only come up for sale about once or twice a year.
As Bastelfix mentioned, there isn't a fix for ESP and AWD, however I'm having trouble getting the 5 speed manual and front wheel drive coded as well.
Questions:
Should I go full Syncro or try for the Haldex setup? The T4 I have doesn't have any AWD parts, so I need to import all of the parts from Europe.
Should I keep my AXK VR6 (only 12000 km on engine) or move to a different motor like the 2.5L TDI?
Do you think it is possible to retain the AXK VR6 and have a Haldex 4motion setup?
Additionally, for those that done the Haldex swap, is it only possible to use the 1st generation controller?
Are there any parts lists or guides I should look at? I've been trying to get information from ETKA on the web.
Unrelated:
Has anyone installed the OEM electric sliding door? https://www.bus-ok.de/T4-Nachruestsa…glNr-KDNDHL8003
Thanks again for the help!