I just bought one of those diagnostic leads from eGay and run it up in vag-com it came back with quite a few error codes which i have listed below:
VAG-COM Version: Release 311.2-N
Chassis Type: 1H - VW G/J/V Mk3
Scan: 01,02,03,08,15,25,56
Address 01 -------------------------------------------------------
Controller: 037 906 024 BE
Component: DIGIFANT 3.2 1953
2 Faults Found:
00525 - Oxygen Sensor (G39)
03-00 - No Signal
00513 - Engine Speed Sensor (G28)
27-10 - Implausible Signal - Intermittent
Readiness: N/A
Address 03 -------------------------------------------------------
Controller: 3A0 907 379 E
Component: ABS/EDS ITTAE 20 GI V00
Coding: 03704
Shop #: WSC 00000
3 Faults Found:
01276 - ABS Hydraulic Pump (V64)
16-00 - Signal Outside Specifications
00287 - ABS Wheel Speed Sensor: Rear Right (G44)
35-00 - -
00287 - ABS Wheel Speed Sensor: Rear Right (G44)
16-10 - Signal Outside Specifications - Intermittent
Skipping Address 15-Airbags
Address 25 -------------------------------------------------------
Controller: 1H0 953 257 B
Component: IMMO VWZ3Z0T2358765 V00
Coding: 09600
Shop #: WSC 00000
No fault code found.
End -------------------------------------------------------
I think the most serious of these is the "00513 - Engine Speed Sensor (G28)" which is probably the reason the car wont start. I was thinking of clicking on the "Clear all DTCs" button to clear the errors (i think thats what it does) and then trying to start the car again. Will this give me a better idea of the fault as im worried some of these are old faults that were never cleared, do you think this would work and do you think that the engine speed sensor is likely to be my problem (original thread here:
http://www.golfgtiforum.co.uk/index.php?topic=81906.0 )