Roughly 100,000 Ford and Mercury minivans might be added to a recall announced earlier this year.
The National Highway Traffic Safety Administration (NHSTA) is watching vehicles sold outside states included in the initial recall.
The campaign targeted about 230,000 Ford Freestar and Mercury Monterey North American minivans in March because rust in the wheel wells can let the third-row seats come loose. The affected vans range from the 2004 to 2007 model year and were sold in cold-weather states where road salt is used.
SEE ALSO: Ford Recalling 230,000 Minivans
NHTSA said problems are rare and is only aware of one problem reported by an owner outside the area affected by the recall. The investigation is closed, but owners not covered by the recall may still contact Ford for repairs if their van shows signs of rust.
The rusting area can weaken the mounting brackets that attach the seats to the floor. A new bracket will be installed away from the rusting area and a panel will be installed to prevent further water entry on affected units.