VW has had a new business model for parts and making money. They are modularizing parts that have more features and more sensors in a single part. When one "feature" fails, you have to buy the whole, much more expensive modularized part with a significant price tag, to fix the one feature that failed. This enhances VW's bottom line by selling much more expensive parts to you when something fails, and much more expensive labor removing the whole part instead of just unscrewing the single bad sensor. This became effective in 2013 on VW Touaregs, with parts prices like Porsche Cayennes.
Don't buy, own or operate a Touareg if you can't afford the price tag of parts for a Luxury SUV. Parts and labor for them are the same as on exotic or expensive marquee cars.
A long, long, long time VW and TDI owner. VW plans to gouge you on parts and labor, with their new, lesser, more modularized headlights, shifter columns EGR recirculators, coolant thermostats, etc, etc, etc.