In an unusual move, the National Highway Traffic Safety Administration said it planned to continue an investigation that led to two big recalls this week from Ford and Mazda.
Ford is recalling over 421,000 Escapes, while Mazda is recalling about 217,500 Tributes.
The issue involves a defect in the cruise control cables that could make the small crossover vehicles susceptible to unintended acceleration. They are mechanical siblings.
Typically, the safety agency concludes an investigation once a recall has been announced, but not this time.
“N.H.T.S.A.’s investigation into this issue remains open, pending the agency’s review of the documents provided by Ford in its recall action,” an agency spokeswoman, Karen Aldana, wrote in an e-mail.
Ford and Mazda say they are cooperating.