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In general, Mercedes Benz cars are known for being reliable, and the 2015 S550 lives up to that reputation. However, there are a few issues that some drivers have experienced, including problems with the HVAC blower motor, camshaft adjuster solenoid, and crankshaft position sensor. Transmission issues can also occur, typically due to a faulty transmission drive selector. Some drivers have noticed premature brake wear, which could be related to driving habits. Occasionally, there may be oil seepage from the back of the cylinder heads, so it's important to monitor your oil levels closely to prevent any potential problems.
Two concerns regarding the 2015 Mercedes-Benz S550 are malfunctioning sensor modules that impact the airbags and fuel pumps that fail prematurely.