I was told by the garage that the mk3 don't need to be reset its the mk4 and up tbh i dont think they know what i was going on about. Throttle body was from vw. The bloke I got the car from said the lamba sensor was new. I did fill it right up and got 210 miles. Think the best thing to do is get it plug in again some where else. Thanks for the help mate. Just need to sort out the petrol I got the 1.4 so it was good on petrol it's costing me boom to run I might as well got vr6 lol
210 miles to a full tank - I get more than that (well more) when i drove only 3 miles to work and back for a month during winter! and that's in my 1.8 estate.... on a 1.4 you should manage 40mpg fairly easily unless you're only doing short trips round town.
Even if it got a new lambda doesn't mean it's working correctly, could be wrong part or as simple as a wire is broken and ecu is not getting a correct signal.
go on google and search for vdcs map from vwaudiforum....

sure there must be someone in kent with vcds that can do a proper log while you're driving... that will tell you a lot more than fault codes (mk3's are early OBD cars and not very good in reporting faults precisely).