Hands down 2003 Range Rover which was nothing but problems from the day I brought it home with 7 miles on it. It was so bad that it was comical.
In addition to all its other problems, at 7500mi, if you accelerated in the rain, you got a lap full of water. If you stopped, it would wash down the inside of the windshield. The rain washing the inside of the windshield caused a short that would make the directional signals tick like they were on (They weren’t on). To make the constant ticking stop you had to turn on the headlights
That car was so stupid if somebody gave me a Range Rover I’d sell it and buy anything else.