The XC Falcon had a lot of rust issues, especially in the doors and door sills. It also was not the most water tight car with numerous reports of water leaking into the cabin and/ or boot.
Earthing issues
Electrical issues
Rust in door sills and in bottom corners of doors and around windshields
Water entering boot and cabin
Water entering in between door and rusting out locking mechanisms and window winding mechanisms
Leaking around the firewall
Fuel pump issues