2011 Mercedes-Benz CLS550 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2011 Mercedes-Benz CLS550

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2011 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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2011 Mercedes-Benz CLS550 Questions

What would cause a vibration that seems to be a cabin area vibration. (1 answer)

When I drive the car, starting at about 35 to 80 mph, I get a harmonic cabin vibration for about 35 - 40 miles. It even happens on a newly paved 6 miles stretch of brand new highway. It begins to dissipate the further I drive. On my way home I get no vibration or its very faint no matter the ro...

A/C stopped working, car just turned 26,000 miles (1 answer)

no faults found when scanned, all the controls inside are working correctly, has the a correct charge of freon, has no power at the a/c compressor when checked with a test light, do have power on the red/white wire on the high pressure switch.

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2011 Mercedes-Benz CLS550 Reviews

Rated
based on 1 customer reviews
This car makes me smile everytime I get in it and push on the accelerator! Awesome car!

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