OK here's another one, by the way I've only had the car for about 6 weeks so still ironing out the creases lol, 

When I got the car, a4 b6 2.5 v6 tdi quattro, think it's the 163 version, I was told it had been remapped to give better fuel consumption, thought ok it can be done, but doing a bit of poking around the engine and noticed the maf sensor plug not connected, asked the guy I bought it off and he said that the company that done the remap deleted the maf as this was to help fuel economy, I know you can delete the egr and dpf but never heard of a maf being deleted, is it possible and is it a good or bad thing, no lights were on on the dash which makes me think it was deleted although when I reconnected it I noticed my miles left on the dash didn't drop as quick as they normally do, I'd do a 30 mile trip stopping and starting and lose  maybe 50-60 miles where as today I done the same trip and only lost 20, which is more realistic, doesn't feel any different in driving response, any ideas as I don't have vcds or know anyone local that could do a test on it with vcds 

If you disconnect the MAF the ecu will assume low output and usually therefore low powere/poor economy I would think.

I thought that too James although with vcds lite its code gives a maf sensor short to plus, doesn't see the maf even when it's plugged or not plugged in, there's a revo specialist half an hours drive away so it might be trip there 

Yes probably sounds like the best idea to let a specialist take a look.

That's definitely an issue with buying cars that have "unknown" remaps on them. You could always get a Revo map on it instead?

I think that's the way to go James, although I'll have to wait a few weeks and get the greyhounds gathered up, for a proper revo remap it's somewhere around £300 as far as I know.