Thanks very much for your help Mike and AVPerformance

I've been reading around about the wayne angle blocks and those anti-foul sockets, figured that method is going to be the cheapest option to see if I can get the code to stay off for some length of time. I've got a couple on order (designed for the same purpose on hydrogen hybrid motors) for less than £20 - still cheaper than if I'd gone to audi/specialist for a diagnostic.

I presume that a remap is what you are suggesting AVP? I'd be interested if I was keeping the vehicle, but I just want to get it fixed up ready to sell now. I'll keep it in mind though as I can't sell a duff motor, unlike the guy who sold it to me...

Anyone in the market for an '02 S8 on 130k watch this space (still a few other jobs to finish yet)