ecu compatibility

[spxxx]

will an AEB coded ECU 557n fit a car that originally had an ECU coded for AEB with code 557p???

[Siena]

If the plugs are compatible, then yes, they'll be interchangeable.

Audi tend to put tags on plugs, to prevent mistaken connectivity between incompatible units.

[Burntaudi]

Yes. But you might have to change the soft code if the options are different from the donor car.

[AEB A4]

bringing this back up top.

how do you change the Soft code? i got a pc-16 file with a ecu that says 577N and mine is a 577P. I havent installed it yet but i dont want any downtime while i figure out if it will work.

How would you know if the soft code has to be reset?

[Burntaudi]

bringing this back up top.

how do you change the Soft code? i got a pc-16 file with a ecu that says 577N and mine is a 577P. I havent installed it yet but i dont want any downtime while i figure out if it will work.

How would you know if the soft code has to be reset?

You need a Vag-com. Go to www.ross-tech.com you find the directions there. FYI you only need to change the soft codes if car had different options. Frontrak or Quattro Auto or 5 speed ...ETC.

[AEB A4]

ok, the guy who had it before me had the same car as me ( manual, quattro, 1.8t AEB, etc. etc.) so i think i should be fine then, thanks for the fast response

[Burntaudi]

ok, the guy who had it before me had the same car as me ( manual, quattro, 1.8t AEB, etc. etc.) so i think i should be fine then, thanks for the fast response

Yep you don't need anything if your options were the same.