DETROIT (AP) — For the fourth time, Nissan is recalling hundreds of thousands of midsize cars in the U.S. and Canada to fix a nagging latch problem that may allow the hood fly open while cars are moving.

The latest recall covers nearly 1.9 million Altimas and includes cars from the 2013 through 2015 model years that were recalled earlier. It’s also been expanded to the 2016 through 2018 model years.

Nissan has said previously that a coating can flake off the secondary hood latch, exposing bare metal. Over time, the metal can rust and cause the secondary latch to stay open. If the main latch isn’t closed and the cars are driven, the secondary latch may not hold the hood down as designed, Nissan said.

Some of the cars were recalled in 2014, with another recall in 2015, both of which involved fixing a lever and adjusting and lubricating the secondary latches. In a 2016 recall, Nissan replaced the latches with new ones.

The company says it has 16 reports of minor crashes and-or injuries due to the problem, all in cars that did not get the replacement latches. There are no reports of crashes or injuries in cars with new latches, Nissan said.