2012 Mercedes-Benz S550 Repair and Maintenance

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

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2012 Mercedes-Benz S550 Problems

Oil Seepage on Back of the Cylinder Heads

The Mercedes Benz S550 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.

Check Engine Light Due to Faulty Camshaft Adjuster Solenoid

The camshaft adjuster solenoid (which is related to the variable valve timing system) may fail or timing chain/balance shaft components may wear, resulting in illumination of the Check Engine Light and various drivability issues. Mercedes-Benz has released a service bulletin outlining specific repair instructions depending on fault codes stored.

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2012 Mercedes-Benz S550 Questions

Service light (1 answer)

How do you re set the service light after a 20,000 mile service oil change?

Srs malfunction due to accident. Airbag need to replace (2 answers)

How much does it cost to repair airbags

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2012 Mercedes-Benz S550 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 Reviews

Rated
based on 4 customer reviews
Purchased 2012 S-550 with 18,000 miles within first month had stall converter replaced in transmission and speaker replaced. Car pulls to right and back tires need replaced every 10,000 miles. At 40,000 had to replace front rotors and brake pads. Very happy with cars performance but replacing tires every 10,000 miles and having to replace brakes at 40,000 is upsetting.
My first Mercedes. a 2012 S550. cars pulls bad to the right. Thought is would be a tire or alignment problem. Was told they all did that, and there was no adjustment to correct it. I did search the internet and found out Mercedes does make a factory repair kit called a caster bolt kits that does allow the caster adjustment. It was installed on my car and did help some, but had to replace both f...
I bought my 2012 S550 on Oct 2012 and noticed the car was pulling to the right while driving on a flat road. I took the car to dealership to fix this alignment problem three times and the problem was not completely fixed. Last time when I brought the car back to dealership, the shop foreman told me that all S550s have the same problem that pull to the right. He even let me test drive another ne...

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