Yes. As far as I know, all 2.7T ecus are interchangeable.

Except, if your car requires an immobilizer, you must use an ECU with an immobilizer. I think this only affects the Allroad.

Supporting EEPROM reading and writing over OBD is a feature I am hoping to add in the near future.

Sounds like you're good to go if your A box already has an M box flash. You can try flashing a M box file onto the J box, if it starts you win, if not no big deal nothing will be harmed as long as the flash's checksums were good.


This is awesome pro level stuff right here!

I can definitely eff some ecu's up figuring out out for you. I have about 10 that I'm never going to use. Thus far an esp light is all that has  popped up. That was naturally aspirated immo 3 passat into first my 01 apb AR which worked /tuned /flashed great, then sold to Mr Og 4b0 apb also. I will say with absolute confidence until I ponder possible rude responses, any 4Z7, 4B0, and 8D0 will work. Ending in J, m, AA, l, yada yada has not mattered once for me. You must must must nix the immobilizer first. I've never been able to write to one. I shaved off 200k miles, and I have no immobilizer, but never been in boot mode successfully, nor reading via me7_tool.exe 1.3 preferred I can get the files but never flash them.

I just found a sticky note with a ecu sticker on it.. It's from an immo 3 n/a 2.8 95040 400bb... Same thing I did with the 4bo mentioned earlier, solder 800bb on, but only after getting the matching cluster and ecu. It's too early so I honestly can't recall how.. Vwtool or vag k+ 2.5. I think but truly can't recall (I'll have to search one of my laptops) I do end up cmd prompt flashing vin and such. Idk point being loads of compatibility s4wiki doesn't even touch. I've spent over a week hours and hours at junk yards documenting what pn's have what eeprom and memory layout. Also got about 15 ecu's from local shops which was nice of them. All dead, but chips  are all that matter.

Just realized this is like 8 years old.. Oh well...nefmoto for ya.

Having an allroad myself, I have found apb a6's to be no different. Allroads are always claimed to be more complex. When I started out it took me 2 successful flashes before I was lied  to and 'good checksums' was actually a lie via checking on cmd or guilt. With the 4b0 a6. Litteraly dead serious, within 10 minutes it was bricked. No resistor, not pin, voltage, time held or not held brought either back. That said boot mode is a farce.

N75's are unnecessary if you roll with wastegate pressure or manually control them so that's not a big deal. 2.8na on 4b0 2.7t has been perfectly running for months now minus abs and esp. Controlling vvt, (this may be a dumb question), didn't need to be controlled as default 'normal' timing will run it  just fine?

Have fun with part throttle.

Sorry for digging this thread, but I have a question about cross flash possibilities.

A colleague of mine done 2.7T manual swap in his 3.0 tip Audi B6.

I was able to recode his ABS module for manual, however it seems ECU that he get is from Tiptronic car, and it is not possible to be recoded for manual.

Can you help me with a file version that should be suitable for this conversion.
It should be for late C5 2.7T manual.

Now the ECU is with number 4B0907551N software 362561.

Regards,
Chris