Faulty Haldex Controller on a Mk1 TT 53 plate

[Peter Paul]

The ESP light comes on intermittently (more often than not now) I'm told that it is the FWD controller unit is faulty (MOT Fail these days)and this is a Gen 1 box which is no longer available, only 2nd hand spares available on eBay.

My tech man has told me that I would need to replace the whole rear gearbox controller and all to fix this problem, however, someone else on my web search on this topic has told me that a gen 2 or later will not work with my ECU. Can anyone enlighten me on this subject as I was rather hoping to keep this car as a classic.

Thanks in advance