Neuk_
Honorary Master
VCDS is a must with VAG cars, not only for diagnostics but also for tweaking stuff like how many times your indicator flashes when using the comfort flasher, how long your coming-home lights stay on, disabling features you don't need (headlight washers) etc.
It's pretty pricey though, I think around R4k for one with a three-VIN limit. But well worth it if you are planning on doing your own repairs
Or just make friend with someone who has an unlimited VIN version...

