39: Jaguar X-Type
When Ford took over the Jaguar brand at the end of the 1990s there was hope that it would be revived. While there were new cars that were introduced such as the X-Type, their build quality was horrible. The X-Type is largely considered one of the most unreliable cars on the road. The repair costs for this car when it was new were astronomical and they still cost a lot today (via Car and Driver).
Not only were the engine choices agonizingly bad, but reliability was also questionable at best. The X-Type was a flop for the Jaguar brand and part of the reason was because of the reliability issues. Consumers didn’t want to deal with that when the car was brand new and they don’t want to deal with that in a used car now either.