Immobilizer part number differences

[bdr986]

Already posted this on Rennlist but maybe I'll have more luck here.

Hello! First time ever posting in this forum (or any forum for that matter).

I have a pretty major problem with my 1997 986. During a recent rainstorm the cabin flooded and my M534 alarm control module flooded. I managed to get it working again once after scrubbing it with isopropyl alcohol but after one successful startup it never worked again. I've researched this topic enough to know that it's possible to swap EEPROM's by soldering it to a replacement board and it should then work without needing any programming (as long as the EEPROM is in okay condition). Is this correct?

The thing that is confusing me are the different part numbers of the same alarm control unit. Are these interchangeable? The one in my car is part number 996 618 260 00. Is it okay if I order part number 996 618 260 02? Would it work if I swapped the EEPROM's with mine? If I were to order the part with exactly the same part number as mine it would cost 3x more than the one with 02 at the end.

Can anybody help me with this information? What are the differences between the different part numbers of the same unit?

Thank you very much in advance.

[Pringle86]

You can swap the EEPROM from your old alarm control module to a new one to avoid reprogramming, as long as the EEPROM is still good. The different part numbers usually mean slight updates or improvements, but they should be compatible.