Missan Micra (55 plate) - Failed Power steering - VickyG

Following the failure of the steering motor in my Nissan Micra (55 plate), I've replaced with a second hand steering motor and ecu.

I've no problem staring the car, but 5 minutes into every journey, the red NATS light comes on. It does not affect (yet) my ability to continue driving.

According to the mechanic who did the work, I need to get my car key re-programmed to the new ECU, which is only something that Nissan can do.

However, Nissan say they are unable to perform the reprogramming as it's not a 'genuine' (ie new) part.

My questions are:

- Is it likely that the new ECU will suddenly decide not to work one day because it's not been reprogrammed?

- If it is, is there any way I can get the ECU reprogrammed so that I don't have to pay the £1018+VAT Nissan want for a 'genuine' part?