Mercedes and BMW are recalling more than 400,000 cars.
BMW recall covers more than 156,000 cars and SUVs in the U.S. because the engines can lose power or stall. The German automaker is recalling some models from 2010-2012 128i, 328i, Z4, 135i, 335i, 528i, 535i and 640i cars, as well as X3, X5 and X6 SUVs.
According to the National Highway Traffic Safety Administration, bolts holding a camshaft housing can loosen and break, causing diminished power or stalling, increasing the risk of an accident.
BMW authorised dealers are instructed to have defective bolts replaced free of charge. The recall is reported to launch in May.
The automaker has announced that another 170,000 vehicles from 2010 through 2012 equipped with inline six-cylinder engines are not covered by the recall, but will get an extended warranty due to the issue.
Mercedes recalls cover approximately 284,000 C-Class sedans in the U.S. and Canada because an electrical issue could make the taillights to tarnish or fail, according to the documents filed with NHTSA. According to the company spokesman, vehicles in other countries are also covered, but the exact number is not specified yet. The automaker recalls some C300, C350 and C63 AMG vehicles from the 2008 through 2011 model years.
Rusting on a connector can cause the brake, tail or rear turn signal lights to tarnish or fail. As a result, the car becomes less visible on the road, raising the risk of a collision.
The company official state that a dashboard-warning message will appear if the problem occurs.
In 2009, the automaker got five field reports, which stated, that a failure of the tail lamp was due to loss of electrical connection. The cause was not specified at that time and allotted for further research, according to the safety regulators documents.
Last year, NHTSA started investigating the issue and Mercedes provided with necessary information in October, the documents state. Further information was requested in March, and in preparing to answer, the automaker decided to issue a recall.
According to the NHTSA, the dealers will have the bulb holders and any corroded connectors replaced. Replacement parts will be available only in August or September, but owners will get interim notifications in June.