“If the aforementioned machining debris adheres to the bearings and operation of the engine continues at higher loads over time, failure of the bearings may occur,” NHTSA wrote. “This can lead to potential engine knocking, engine rough running, engine no start and/or an engine stall.”

Hybrid vehicles can continue to drive for limited distances in the case of such an engine failure, NHTSA said.

The recall resulted from engine failure reports in March 2022, according to a timeline made public by the agency. The timeline did not mention any injuries or deaths resulting from the engine problems.

No remedy is yet available to fix the problem. Notifications to owners of the affected vehicles are expected to go out by July 29, which reflects the maximum timeline required between announcing a product recall and notifying vehicle owners, according to Michael Brooks, executive director of the nonprofit Center for Auto Safety.

The Toyota recall “looks like one that is headed for a longer remedy,” Brooks said.

Still, he added that the recall notice should help make drivers aware of possible problems with their vehicles.

“Drivers are also provided with signs to look for that might precede the safety problem — engine knocking and rough running can tip them off to the fact that they need to stop driving the vehicle or risk stalling/loss of motive power, which is the real danger here,” Brooks said.

Lexus and Toyota have said vehicle owners can request a loaner vehicle for $55 per day. Owners are advised to contact NHTSA safety hotline at 1-888-327-4236 with any questions.