If suspension bushes, struts are worn out, it won't drive like a german car should.
Proper suspension rebuilds aren't cheap.
Electronics are connected over connections you can think like a usb hub. Fault in one part affects others and tracing ain't easy. If you are ready to read dozens of threads, throw expensive parts at it to make it work, you should buy it.
People who afford brand new german cars, sell them just before these cars are going to show signs of needing more than usual service. e.g. when the handling doesn't remain like a new car, instead of spending hefty amount on suspension rebuild, they sell it before it actually starts to feel like driving garbage. Same thing when engine / transmission requires service (e.g. turbo, direct injection engines start knocking), they get the engines serviced to appear running right till a few thousand KMs the car is sold, disguising the problem instead of eradicating the problem completely.
The cars when not running right become a headache to sale, depreciate like hell.
