Engine Malfunction

[JamnX5]

Hi all, I have 09 4.8 X5 with 82k+ miles. I was getting engine malfunction messages last week. They first replaced the throttle wiring harness. All seemed fine until a week later I get the same message again. This time its the actual throttle valve. Valve replaced and all seemed fine. The car even felt like it pulled off the line better. I'm a bit irritated that I had to pay $50 for the CPO fix.

Anyway, fast forward to today. I'm exiting the highway (25 minutes drive from work) and I get AWD/DSC malfunction message. Dealer will be checking the car tomorrow. I'm getting a bit concerned..should I be looking to trade my vehicle in? Even more annoying is the $50 CPO fee. Maybe they will wave this one because I have been in so many times.

Any thoughts on the root cause? Thanks.