All,

The AQS wasn't working in my car since my ownership started. Based on another forum recommendation, I purchased the VW part 1K0907659 (VW Golf MK5,Scirocco, Passat, Caddy) AQS unit from ebay for £12.99.
http://www.ebay.ie/itm/Climate-Quali...EAAOSwYGFUvz6d

Ordered at the 17th of Feb and received at the 25th of Feb. Installed today - working perfectly and finally my car is completely error free
The original Volvo part costs around 2xx €.

Based on the other forum comments, it may not going work with 2005+ (facelift) cars, but for the price worth the try.

Both, the VW and Volvo parts are manufactured by a company called Paragon. http://www.paragon.ag/en.html

As far as I see, the AQS has been discussed here as well, however nothing was mentioned about the VW part replacement possibility.

http://www.vpcuk.org/forums/showthre...y-Sensor/page2