Last month, Ford announced that it was recalling 2,900 Ford Rangers from model year 2006 after a second death was linked to Takata airbag inflators built on the same day.
The expansion was ordered following additional safety testing, and now covers a broader time frame of production.
Mazda said it was issuing a similar expanded recall for about 1,800 B-Series trucks from model year 2006 that were manufactured by Ford after it had issued a warning for 160 trucks last month.
NHTSA said the vehicles pose “an immediate risk to safety” and urged owners to immediately schedule a free repair.
Ford said dealers will tow the pickups to service bays to replace the faulty airbag inflators and provide loaner vehicles free of charge.