2012 Mercedes-Benz S550 4MATIC Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2012 Mercedes-Benz S550 4MATIC

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2012 Mercedes-Benz S550 4MATIC Problems

Oil Seepage on Back of the Cylinder Heads

The Mercedes Benz S550 $Matic 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 S550 4MATIC Recalls

Potential Fuel Leak

Due to a manufacturing defect, a crack can develop on the fuel filter when the vehicle is operated in high temperatures. This crack can result in a fuel leak, increasing the risk of a fire. Dealers will replace the fuel filter to correct this concern.

Tire Pressure Monitoring System Malfunctions

The tire pressure monitoring system warning light may not come on or stay on for appropriate lengths of time. Dealers will reprogram the tire pressure monitoring unit free of charge to resolve the concern.

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2012 Mercedes-Benz S550 4MATIC Reviews

Rated
based on 1 customer reviews
09/20/2012 2012 S550 4 Matic. Second time in the shop. 1st problem - the heated steering wheel didn't work from the beginning had to wait for over a month for a new steering wheel to come. 2nd problem - started at around 7k miles and at least once a week it's loosing power at speeds between 60-80 mph and starts shaking. Took it to the dealer. Transmission problem. Now they are waiting fo...

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