2012 Mercedes-Benz CLS550 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2012 Mercedes-Benz CLS550

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2012 Mercedes-Benz CLS550 Problems

Airmatic Pump Motor May Fail Due to Sticking Relay

A sticking relay, causing the airmatic pump motor to constantly run, may causee the airmatic pump motor to fail or the battery to go dead when the car is shut off. Worn airmatic pump mount bushings can causes noises in the front axle while driving on bumpy roads or a buzzing noise.

Low Vehicle Ride Height Due to Leaking Rear Air Springs

Rear air springs (bellows) may develop leaks, which causes the air pump to run more often to maintain ride height. Our technicians recommend that leaking air springs be replaced.

Oil Seepage on Back of the Cylinder Heads

The Mercedes Benz CLS550 may have engine oil seeping or leaking from the back of the cylinder heads. This is commonly misdiagnosed as leaking valve covers.

On the back of the cylinder heads there are three, in total, plastic expansion plugs that plug access ports to the camshafts. These plugs are well known for seeping oil, and leaking if left unattended. The oil will run down the back of the engine and eventually make it to the ground. 

Replacement of these three plastic plugs is extremely simple, and should be done as regular maintenance. The recommended interval for replacement is every 60,000 miles.

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2012 Mercedes-Benz CLS550 Recalls

Tail Lights Do Not Light On The Sides

The tail lights may not light up on the sides, which can make it difficult to see the vehicle. This fails to comply with federal safety standards. Dealer will update the lighting controller software free of charge to correct the problem.

The Hood May Open Unexpectedly While Driving

The bolts securing the secondary hood latch may not have been properly tightened during vehicle assembly on 23 vehicles. The could result in the secondary hood latch becoming ineffective. If the hood were not properly secured by the primary latch and the the secondary latch was not functioning, the hood could open while driving, increasing the risk of a crash. Dealers will check and retighten the bolts on the secondary latch as necessary to correct this concern.

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