Car wont start !!! Please help urgent.

[Chaz]

So I connected VCDS to see why my adaptive cruise control warning was on. It suggested a voltage issue. I looked at the fuses.

Whilst I was looking I saw two connectors (one in each fuse box) and disconnected them to see what they were. They look to be power distribution of sorts. Plugged them back in, got loads of errors.

Since that, car wont start. Getting 05650 - Engine Control Module Incorrectly Coded amongst others. I Can clear them, they go away but come back.

With the key in my hand, car turns over, fires and then dies immediately.

With the key in the ignition, car turns over but never fires.

Clearly its not happy that Ive disconnected. The key works, locks / unlocks. On a BMW this would have been an issue where the 'Key Reader' and the ECU needed to be matched.

How do I do this on the A8? I can see some coding options in Access module but I dont know how to do this.

My car is stranded in my driveway, I cant get my wife's car out. We have an appointment in a while but that can be missed, but wont be able to get to work tomorrow.

Anyone help please?

Thanks