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Mercedes-Benz M-Class Most Common Problems

12
trunk or tailgate latch
12
wheel bearing / hub
11
power door lock actuator / solenoid
10
thermostat
9
bulb: headlight
9
heater for DEF (diesel exhaust fluid) / AdBlue
9
oil cooler line / hose / gasket
8
strut (suspension)
7
blind spot and/or lane departure warning sensor / radar
7
body control module (BCM; also CEM, GEM, IPDM)
7
crankshaft position sensor
7
damper / shock absorber
7
engine seal / gasket, other or unspecified or unknown (oil leak)
7
idler pulley for accessory / serpentine / drive belt
7
power steering pump
7
tail light wiring
6
coil spring
6
ignition switch / key cylinder
6
NOx sensor
6
power window switch
 
2   4   6   8   10   12   14   16   18   20  
Chart is based on 393 vehicles in TrueDelta's reliability survey.
These are the problems owners most commonly reported on TrueDelta's Car Reliability Survey. For many models not all entries have been coded yet, so focus on the relative numbers rather than the absolute numbers. Usually when people say "they all have this problem," the problem in question actually affects between 10 percent and 20 percent of all cars. We aren't counting wear items like brake pads and rotors that truly do require periodic replacement on all cars.

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