BMW has announced it is recalling 156,137 2010-'11 vehicles because loose bolts could potentially cause engines to stall, according to the National Highway Traffic Safety Administration.

The recall will begin sometime in May. An exact recall date has not been announced yet by the automaker.

Affected vehicles include: the 2010-'11 128i coupe, 128i convertible, 328i sedan, 328i xDrive sedan, 328i coupe, 328i convertible, 328i sports wagon and Z4 sDrive 30i, 2011-'12 135i coupe, 135i convertible, 335i sedan, X5 xDrive 35i, and X6 xDrive 35i, 2011 335i xDrive sedan, 335i coupe, 335i convertible, 528i sedan, 535i sedan, 535i xDrive sedan, X3 xDrive 28i, and X3 xDrive 35i, 2010 X3 xDrive 30i, and X5 xDrive 30i, 2012 640i coupe, and 640i convertible and 2010-2012 535i Gran Turismo.

No accidents or injuries have occurred as a result of the issue yet, according to the automaker.

"In the affected vehicles, the bolts that secure the housing for the variable camshaft timing adjustment (VANOS) unit can loosen over time and may possibly break," said NHTSA regarding the recall. "If the bolts loosen or break, the engine may have reduced power or stall. An engine stall increases the risk of a crash."

Owners of approximately 170,172 2010-'12 BMW vehicles equipped with inline six-cylinder engines are not covered by the recall. They will instead receive an extended warranty to address this issue, according to the NHTSA.

BMW dealers are being instructed to inspect, and if necessary, replace the four VANOS housing bolts for both VANOS units. If an issue is found vehicles will be repaired free of charge.

Owners with more questions can reach BMW at 1-800-525-7417.

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