U.S. automaker Ford on Friday issued four safety recalls in North America, which will affect about 38,236 vehicles.

The biggest recall involves approximately 37,801 Ford Expedition and Lincoln Navigator vehicles, both 2018 models. Their second-row center bench seats may be missing J-channel reinforcement brackets in the seat track assembly.

A seat track missing one or both J-channel reinforcement brackets may not properly restrain the seat assembly during a crash, increasing the risk of injury. However, Ford said it was not aware of any accidents or injuries resulting from this condition.

Most of the affected vehicles were sold in the United States and federalized territories, with 1,900 in Canada and 955 in Mexico.

The second recall is for approximately 160 select 2018 Ford Explorer vehicles with 2.3-liter or 3.5-liter GTDI engines for a misassembled fuel pressure sensor that may result in a fuel leak, increasing the risk of a fire.

Ford issued the third recall for approximately 271 Lincoln Nautilus vehicles of 2019 edition to replace driver airbag modules. They may have improperly injection-molded plastic covers that may separate during deployment, increasing risk of injury in a crash.

The last recall is very limited. Four 2019 Ford Super Duty vehicles sold in the United States may have a transmission casing problem.

All the inspection and replacement of parts will cause no cost to customers, said Ford.