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Mercedes-Benz S-Class MOT Results

69.6% pass rate
from 2,537 tests in 2017
Number of tests by age
Failure rates by item

Here you can drill down into the failure rates for each item on the test. We've also compared the rates to the average results for pre-1990 cars and highlighted areas where the Mercedes-Benz S-Class is unusually good or bad.

  • 15% fail on Lamps, Reflectors and Electrical Equipment
    • 4.7% fail on Headlamp aim
    • 3.2% fail on Rear fog lamp (41% worse than other pre-1990 cars)
      • 2.6% fail on Fog lamp
      • 0.95% fail on Tell tale (120% worse than other pre-1990 cars)
      • 0.51% fail on Switch (2 times worse than other pre-1990 cars)
    • 2.8% fail on Position lamps
      • 1.7% fail on Front lamps
      • 1.3% fail on Rear lamps
    • 2.6% fail on Registration plate lamp
    • 2.1% fail on Headlamps (39% better than other pre-1990 cars)
      • 2.0% fail on Headlamp (34% better than other pre-1990 cars)
      • 0.12% fail on Headlamp defects which don't require an aim check on retest
        • 0.12% fail on Main beam 'tell-tale'
      • 0.039% fail on Headlamp defects which do require an aim check on retest
        • 0.039% fail on Main beam 'tell-tale'
      • 0.039% fail on Switch
    • 1.9% fail on Direction indicators (44% better than other pre-1990 cars)
      • 1.9% fail on Flashing type (43% better than other pre-1990 cars)
        • 0.79% fail on All direction indicators
        • 0.67% fail on Individual lamps (61% better than other pre-1990 cars)
        • 0.63% fail on Side repeaters
        • 0.039% fail on Tell tales
    • 1.9% fail on Stop lamp (35% better than other pre-1990 cars)
    • 1.8% fail on Battery
    • 1.3% fail on Hazard warning
      • 0.95% fail on Lamp
      • 0.39% fail on Switch
      • 0.079% fail on Tell tale
    • 0.43% fail on Horn (79% better than other pre-1990 cars)
    • 0.079% fail on Headlamp aim not tested
    • 0.039% fail on Trailer electrical socket
    • 0.039% fail on Rear reflectors
  • 11% fail on Brakes
    • 6.9% fail on Brake performance (18% better than other pre-1990 cars)
      • 3.4% fail on Rear wheels
      • 2.5% fail on Front wheels (35% better than other pre-1990 cars)
      • 2.0% fail on Parking brake performance (41% better than other pre-1990 cars)
      • 0.99% fail on Service brake performance
      • 0.47% fail on Brake performance not tested
      • 0.20% fail on Brake imbalance (70% better than other pre-1990 cars)
      • 0.039% fail on Brake operation
    • 3.5% fail on Hydraulic systems
      • 3.0% fail on Components
        • 2.0% fail on Pipes
        • 1.1% fail on Hoses
        • 0.12% fail on Reservoirs
        • 0.079% fail on Servos
        • 0.039% fail on Valves
      • 0.43% fail on Leaks
      • 0.12% fail on Operation
      • 0.079% fail on Brake fluid warning lamp
    • 1.6% fail on ABS (13 times worse than other pre-1990 cars)
    • 1.1% fail on Hub components
      • 0.63% fail on Brake pads
      • 0.28% fail on Brake discs
      • 0.20% fail on Brake calipers
      • 0.039% fail on Brake drums
      • 0.039% fail on Brake back plates
    • 0.51% fail on Parking brake
      • 0.51% fail on Condition
    • 0.20% fail on Restricted movement
    • 0.079% fail on Prescribed areas
      • 0.079% fail on Master cylinder/servo mounting
    • 0.039% fail on Additional braking devices
    • 0.039% fail on Service brake control components
      • 0.039% fail on Pedal
        • 0.039% fail on Anti-slip
    • 0.039% fail on Mechanical components
      • 0.039% fail on Cable
    • 0.039% fail on Locking devices
  • 9.1% fail on Suspension
    • 3.7% fail on Prescribed areas
      • 3.1% fail on Component mounting
      • 0.63% fail on Subframe mounting
      • 0.32% fail on Spring mounting (66% better than other pre-1990 cars)
    • 1.8% fail on Suspension arms
      • 1.6% fail on Pins/bushes/ball joints
      • 0.12% fail on Condition
      • 0.039% fail on Attachment
    • 1.3% fail on Front suspension joints
    • 1.0% fail on Anti-roll bars
      • 0.43% fail on Linkage pins/bushes/ball joints
      • 0.28% fail on Attachment
      • 0.20% fail on Pins/bushes/ball joints
      • 0.16% fail on Linkage condition
    • 0.91% fail on Coil springs (160% worse than other pre-1990 cars)
      • 0.87% fail on Condition (2 times worse than other pre-1990 cars)
      • 0.039% fail on Location
    • 0.63% fail on Wheel bearings (63% better than other pre-1990 cars)
      • 0.59% fail on Front (47% better than other pre-1990 cars)
      • 0.039% fail on Rear
    • 0.35% fail on Sub-frames
      • 0.20% fail on Attachment
      • 0.12% fail on Condition
      • 0.039% fail on Pins/bushes/ball joints
    • 0.35% fail on Shock absorbers (64% better than other pre-1990 cars)
      • 0.35% fail on Condition (64% better than other pre-1990 cars)
    • 0.16% fail on Drive shafts (84% better than other pre-1990 cars)
      • 0.16% fail on Front drive shafts (82% better than other pre-1990 cars)
        • 0.16% fail on Constant velocity joints (82% better than other pre-1990 cars)
    • 0.12% fail on Tie bars/rods
      • 0.079% fail on Pins/bushes/ball joints
      • 0.039% fail on Condition
    • 0.079% fail on Fluid suspension
      • 0.039% fail on Suspension unit
      • 0.039% fail on Pipes
    • 0.079% fail on Trailing arms
      • 0.079% fail on Pins/bushes/ball joints
    • 0.079% fail on Radius arms
      • 0.079% fail on Pins/bushes/ball joints
    • 0.039% fail on General condition
  • 8.0% fail on Driver's view of the road
    • 4.4% fail on Wipers (58% worse than other pre-1990 cars)
    • 3.9% fail on Washers
    • 0.39% fail on Windscreen
    • 0.20% fail on Mirrors
    • 0.16% fail on Bonnet
  • 7.2% fail on Exhaust, Fuel and Emissions (25% worse than other pre-1990 cars)
    • 3.0% fail on Exhaust system
    • 3.0% fail on Emissions
    • 1.6% fail on Fuel system
      • 0.99% fail on System (120% worse than other pre-1990 cars)
      • 0.39% fail on Pipe
      • 0.16% fail on Hose
      • 0.12% fail on Cap
      • 0.039% fail on Tank
    • 0.35% fail on Emissions not tested
  • 3.5% fail on Tyres (60% worse than other pre-1990 cars)
    • 2.3% fail on Condition (85% worse than other pre-1990 cars)
    • 1.3% fail on Tread depth
    • 0.12% fail on Size/type
  • 3.5% fail on Body, Structure and General Items
    • 1.8% fail on Body condition
    • 0.79% fail on Vehicle structure
      • 0.79% fail on Chassis
    • 0.79% fail on Seats
      • 0.75% fail on Drivers
      • 0.35% fail on Passengers
    • 0.24% fail on Doors
      • 0.12% fail on Passengers front
      • 0.12% fail on Passengers other
    • 0.12% fail on Speedometer
    • 0.039% fail on Engine mountings
    • 0.039% fail on Body security
    • 0.039% fail on Load security
      • 0.039% fail on Bootlid
  • 2.8% fail on Steering (37% better than other pre-1990 cars)
    • 2.4% fail on Steering system (34% better than other pre-1990 cars)
      • 1.5% fail on Track rod end
      • 0.28% fail on Steering box
      • 0.28% fail on Drag link end
      • 0.16% fail on Steering damper (3 times worse than other pre-1990 cars)
      • 0.12% fail on Ball joint
      • 0.12% fail on Other components
        • 0.12% fail on Steering pivot point
      • 0.079% fail on Free play
        • 0.079% fail on Steering box
    • 0.24% fail on Power steering
      • 0.12% fail on Operation
      • 0.079% fail on Pipes and hoses
      • 0.079% fail on Other components
    • 0.16% fail on Steering operation
    • 0.12% fail on Locking devices
    • 0.12% fail on Prescribed areas
  • 2.0% fail on Seat Belts and Supplementary Restraint Systems
    • 1.9% fail on Seat belts
      • 1.4% fail on Prescribed areas
      • 0.28% fail on Condition
      • 0.20% fail on Requirements
      • 0.079% fail on Attachment
    • 0.079% fail on Supplementary restraint systems (15 times worse than other pre-1990 cars)
      • 0.079% fail on SRS Malfunction Indicator Lamp (16 times worse than other pre-1990 cars)
  • 0.91% fail on Registration plates and VIN
    • 0.91% fail on Registration plate
    • 0.039% fail on Vehicle Identification Number
  • 0.16% fail on Road Wheels
    • 0.12% fail on Attachment
    • 0.039% fail on Condition
  • 0.039% fail on Towbars
    • 0.039% fail on Vehicle structure