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Porsche 911 MOT Results

76.4% pass rate
from 5,171 tests in 2017
(19% better than other pre-1990 cars)
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 Porsche 911 is unusually good or bad.

  • 16% fail on Lamps, Reflectors and Electrical Equipment
    • 6.2% fail on Headlamp aim (41% worse than other pre-1990 cars)
    • 4.5% fail on Rear fog lamp (98% worse than other pre-1990 cars)
      • 4.2% fail on Fog lamp (110% worse than other pre-1990 cars)
      • 0.44% fail on Tell tale
      • 0.25% fail on Switch
    • 3.1% fail on Direction indicators
      • 3.1% fail on Flashing type
        • 1.7% fail on Individual lamps
        • 0.75% fail on Side repeaters
        • 0.60% fail on All direction indicators
        • 0.23% fail on Tell tales
        • 0.058% fail on Switch
      • 0.019% fail on Semaphore
        • 0.019% fail on Tell tales
    • 2.9% fail on Position lamps (20% better than other pre-1990 cars)
      • 1.7% fail on Front lamps
      • 1.2% fail on Rear lamps
      • 0.14% fail on All position lamps
      • 0.039% fail on Switch
    • 2.2% fail on Registration plate lamp
    • 2.2% fail on Headlamps (34% better than other pre-1990 cars)
      • 1.8% fail on Headlamp (42% better than other pre-1990 cars)
      • 0.29% fail on Headlamp defects which don't require an aim check on retest
        • 0.21% fail on Main beam 'tell-tale'
        • 0.077% fail on Headlamp cleaning device (10 times worse than other pre-1990 cars)
      • 0.21% fail on Dipswitch (2 times worse than other pre-1990 cars)
      • 0.058% fail on Headlamp defects which do require an aim check on retest
        • 0.058% fail on Main beam 'tell-tale'
      • 0.019% fail on Switch
    • 2.0% fail on Stop lamp (31% better than other pre-1990 cars)
    • 1.3% fail on Horn (39% better than other pre-1990 cars)
    • 0.60% fail on Hazard warning
      • 0.35% fail on Lamp
      • 0.17% fail on Tell tale
      • 0.15% fail on Switch
    • 0.58% fail on Battery (52% better than other pre-1990 cars)
    • 0.12% fail on Electrical wiring
    • 0.12% fail on Headlamp aim not tested
  • 7.0% fail on Driver's view of the road
    • 5.6% fail on Washers (17% worse than other pre-1990 cars)
    • 1.7% fail on Wipers (40% better than other pre-1990 cars)
    • 0.19% fail on Mirrors
    • 0.12% fail on Bonnet
    • 0.058% fail on Windscreen
    • 0.019% fail on Indirect vision devices
  • 6.5% fail on Brakes (44% better than other pre-1990 cars)
    • 4.5% fail on Brake performance (46% better than other pre-1990 cars)
      • 2.4% fail on Rear wheels (38% better than other pre-1990 cars)
      • 1.7% fail on Front wheels (57% better than other pre-1990 cars)
      • 1.0% fail on Parking brake performance (70% better than other pre-1990 cars)
      • 0.44% fail on Service brake performance (70% better than other pre-1990 cars)
      • 0.23% fail on Brake imbalance (65% better than other pre-1990 cars)
      • 0.15% fail on Brake operation
      • 0.15% fail on Brake performance not tested
    • 1.7% fail on Hydraulic systems (50% better than other pre-1990 cars)
      • 1.4% fail on Components (46% better than other pre-1990 cars)
        • 0.97% fail on Hoses
        • 0.41% fail on Pipes (71% better than other pre-1990 cars)
        • 0.058% fail on Reservoirs
      • 0.21% fail on Leaks (62% better than other pre-1990 cars)
      • 0.097% fail on Brake fluid warning lamp
      • 0.039% fail on Operation (84% better than other pre-1990 cars)
    • 0.31% fail on Hub components (64% better than other pre-1990 cars)
      • 0.12% fail on Brake pads (68% better than other pre-1990 cars)
      • 0.097% fail on Brake discs
      • 0.097% fail on Brake calipers
      • 0.019% fail on Brake back plates
    • 0.31% fail on Restricted movement
    • 0.17% fail on Parking brake (79% better than other pre-1990 cars)
      • 0.15% fail on Condition (82% better than other pre-1990 cars)
      • 0.019% fail on Electronic parking brake
    • 0.15% fail on Service brake control components (61% better than other pre-1990 cars)
      • 0.15% fail on Pedal (61% better than other pre-1990 cars)
        • 0.14% fail on Condition
        • 0.019% fail on Anti-slip
    • 0.097% fail on ABS
    • 0.058% fail on Mechanical components
      • 0.039% fail on Cable
      • 0.019% fail on Brake slack adjuster
    • 0.019% fail on Air and vacuum systems
      • 0.019% fail on Components
        • 0.019% fail on Servos
  • 3.8% fail on Suspension (61% better than other pre-1990 cars)
    • 1.6% fail on Anti-roll bars (150% worse than other pre-1990 cars)
      • 0.70% fail on Linkage pins/bushes/ball joints (160% worse than other pre-1990 cars)
      • 0.37% fail on Attachment (190% worse than other pre-1990 cars)
      • 0.31% fail on Pins/bushes/ball joints (97% worse than other pre-1990 cars)
      • 0.25% fail on Linkage condition (2 times worse than other pre-1990 cars)
      • 0.077% fail on Condition
      • 0.019% fail on Presence
    • 0.91% fail on Wheel bearings (47% better than other pre-1990 cars)
      • 0.62% fail on Front (44% better than other pre-1990 cars)
      • 0.29% fail on Rear (56% better than other pre-1990 cars)
    • 0.60% fail on Drive shafts (40% better than other pre-1990 cars)
      • 0.41% fail on Any drive shaft which is part of the suspension (2 times worse than other pre-1990 cars)
        • 0.41% fail on Drive shafts (4 times worse than other pre-1990 cars)
      • 0.19% fail on Front drive shafts (78% better than other pre-1990 cars)
        • 0.19% fail on Constant velocity joints (78% better than other pre-1990 cars)
    • 0.43% fail on Prescribed areas (89% better than other pre-1990 cars)
      • 0.35% fail on Component mounting (87% better than other pre-1990 cars)
      • 0.058% fail on Subframe mounting (91% better than other pre-1990 cars)
      • 0.019% fail on Spring mounting
    • 0.27% fail on Shock absorbers (73% better than other pre-1990 cars)
      • 0.27% fail on Condition (73% better than other pre-1990 cars)
    • 0.23% fail on Suspension arms (82% better than other pre-1990 cars)
      • 0.19% fail on Pins/bushes/ball joints (83% better than other pre-1990 cars)
      • 0.019% fail on Condition
      • 0.019% fail on Attachment
    • 0.039% fail on Tie bars/rods
      • 0.039% fail on Pins/bushes/ball joints
    • 0.039% fail on Sub-frames (85% better than other pre-1990 cars)
      • 0.039% fail on Attachment
    • 0.039% fail on Front suspension joints (96% better than other pre-1990 cars)
    • 0.019% fail on General condition
    • 0.019% fail on Coil springs
      • 0.019% fail on Location
    • 0.019% fail on Torsion bars
      • 0.019% fail on Attachment
    • 0.019% fail on Trailing arms
      • 0.019% fail on Attachment
    • 0.019% fail on Macpherson strut
      • 0.019% fail on Condition
    • 0.019% fail on Front suspension retaining and locking devices
  • 3.2% fail on Exhaust, Fuel and Emissions (44% better than other pre-1990 cars)
    • 2.0% fail on Emissions
    • 0.95% fail on Fuel system
      • 0.50% fail on Cap (70% worse than other pre-1990 cars)
      • 0.19% fail on System (58% better than other pre-1990 cars)
      • 0.12% fail on Pipe
      • 0.077% fail on Hose
      • 0.058% fail on Tank
    • 0.37% fail on Exhaust system (84% better than other pre-1990 cars)
    • 0.19% fail on Emissions not tested
  • 1.8% fail on Steering (61% better than other pre-1990 cars)
    • 1.2% fail on Steering system (67% better than other pre-1990 cars)
      • 0.64% fail on Track rod end (57% better than other pre-1990 cars)
      • 0.41% fail on Steering rack (67% better than other pre-1990 cars)
      • 0.077% fail on Other components
        • 0.058% fail on Steering component
        • 0.019% fail on Steering pivot point
      • 0.039% fail on Steering arm
      • 0.019% fail on Free play
        • 0.019% fail on Steering rack
      • 0.019% fail on Ball joint
      • 0.019% fail on Drag link end
      • 0.019% fail on Steering damper
    • 0.43% fail on Steering control
      • 0.35% fail on Steering column (94% worse than other pre-1990 cars)
      • 0.077% fail on Steering wheel
    • 0.12% fail on Steering operation
    • 0.039% fail on Power steering (89% better than other pre-1990 cars)
      • 0.019% fail on Pipes and hoses
      • 0.019% fail on Pump
    • 0.039% fail on Locking devices
    • 0.019% fail on Prescribed areas
  • 1.5% fail on Body, Structure and General Items (59% better than other pre-1990 cars)
    • 0.52% fail on Seats
      • 0.35% fail on Drivers
      • 0.23% fail on Passengers
    • 0.43% fail on Doors
      • 0.27% fail on Passengers front
      • 0.21% fail on Drivers
      • 0.019% fail on Passengers other
    • 0.29% fail on Body condition (78% better than other pre-1990 cars)
    • 0.14% fail on Vehicle structure (87% better than other pre-1990 cars)
      • 0.14% fail on Chassis (87% better than other pre-1990 cars)
    • 0.077% fail on Speedometer
    • 0.019% fail on Engine mountings
    • 0.019% fail on Body security
    • 0.019% fail on Load security
      • 0.019% fail on Bootlid
  • 1.3% fail on Tyres (40% better than other pre-1990 cars)
    • 0.77% fail on Tread depth
    • 0.52% fail on Condition (58% better than other pre-1990 cars)
    • 0.077% fail on Valve stem
  • 1.0% fail on Registration plates and VIN
    • 1.0% fail on Registration plate
  • 0.73% fail on Seat Belts and Supplementary Restraint Systems (66% better than other pre-1990 cars)
    • 0.73% fail on Seat belts (66% better than other pre-1990 cars)
      • 0.46% fail on Prescribed areas (69% better than other pre-1990 cars)
      • 0.14% fail on Condition (68% better than other pre-1990 cars)
      • 0.077% fail on Requirements
      • 0.058% fail on Attachment
  • 0.12% fail on Road Wheels
    • 0.097% fail on Attachment
    • 0.019% fail on Condition