2001 Volvo S60 2.4T 4dr Sedan (2.4L 5cyl Turbo 5A)
This is the worst car I've ever owned without question of the six total. It has expensive issues constantly popping up and has terrible rattles. I will never ever consider buying another Volvo. I can't wait to get rid of it. What a total disaster it has been. I regret the day I bought it. I don't normally complain about things, but they earned my scorn.
My favorite feature is when it runs without the check engine or service required light comes on. Unfortunately, that's not very often.
The best way to improve this car would be for Volvo to buy it back with an apology and premium for all the aggravation they've caused me.