47: 1958-60 Ford Edsel
When you look back at it, the Edsel was actually a technical marvel. The car was a complete revolution in every sense of the word, but with that change came many problems. The Edsel was considered one of the least reliable vehicles ever built by Ford and its new technology didn’t resonate with consumers (via Road and Track).
It turns out that drivers just want a reliable car to drive and the Edsel was far from that. It had multiple issues with the transmission and many other problems that ended up costing Ford more money in the long run.