My friend is looking to but an S3. We went to view one today in Northampton it was a 2000 reg 8L with 98k on, full Audi service history, a very comprehensive history of any work carried out including all MOTs etc. It's an APY engine code and has had a Revo map to 260HP. The car performed very well and the engine seemed very well maintained. I took my VAG hand held scanner to check for trouble codes and got.. 17748.P1340 camshaft position sensor G40/engine speed sensor - G28: incorrect allocation. I have consulted the Ross Tech code reference page and it seems the problem is either a faulty G40/G28 sensor or the timing belt/chain is positioned incorrectly (the timing is out). As the car performed well and idled perfectly I pressume it is a faulty sensor as there is no evidence of bad timing. The cam belt or head have not been worked on/removed since the cam belt change at 70k. Any thought??