Hi all, Merry Christmas and happy new year to one and all. Hoping for suggestions and advice please - I have an on-going problem with my beloved Golf 1.9 tdi. It de-rates (only revs half of normal) every now and again. It's most annoying and I've done the obvious, like changing the fuel filter. It now has the 'check engine' light illuminated. Starts fine, no obvious problems, but has lost power and is not pleasant to drive at half power. No VW dealers in my area and I would like to diagnose the problem myself if possible. First thing I need is a scanning tool I think. Suggestions on what I should consider purchasing? Bear in mind, I live in rural Australia and will have to rely on internet purchasing and postal delivery. Thanks in advance.