Selling your classic car? It's FREE to list your car on Honest John Classics | No thanks

Porsche 911 MOT Results

80.8% pass rate
from 5,125 tests in 2020
(31% 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.

  • 11% fail on Lamps, reflectors and electrical equipment (18% better than other pre-1990 cars)
    • 4.4% fail on Headlamp aim (23% worse than other pre-1990 cars)
      • 4.2% fail on Headlamp aim (27% worse than other pre-1990 cars)
      • 0.21% fail on Headlamp aim not tested
    • 3.6% fail on Front and rear fog lamps (53% worse than other pre-1990 cars)
      • 3.6% fail on Rear fog lamp (53% worse than other pre-1990 cars)
        • 3.5% fail on Rear fog lamp (55% worse than other pre-1990 cars)
        • 0.27% fail on Switch
    • 1.8% fail on Direction indicators (34% better than other pre-1990 cars)
      • 1.8% fail on Flashing type (34% better than other pre-1990 cars)
        • 1.2% fail on Individual direction indicators
        • 0.47% fail on Side repeaters
        • 0.20% fail on All direction indicators (63% better than other pre-1990 cars)
        • 0.020% fail on Switch
    • 1.8% fail on Headlamps (41% better than other pre-1990 cars)
      • 1.5% fail on Headlamp (47% better than other pre-1990 cars)
      • 0.16% fail on Dipswitch
      • 0.14% fail on Headlamp levelling device (2 times worse than other pre-1990 cars)
    • 1.4% fail on Stop lamp (44% better than other pre-1990 cars)
    • 1.1% fail on Electrical equipment (53% better than other pre-1990 cars)
      • 0.78% fail on Horn (50% better than other pre-1990 cars)
      • 0.21% fail on Battery(ies) (68% better than other pre-1990 cars)
      • 0.14% fail on Electrical wiring
    • 0.88% fail on Position lamps (45% better than other pre-1990 cars)
      • 0.86% fail on Position lamp (41% better than other pre-1990 cars)
      • 0.020% fail on All position lamps
    • 0.88% fail on Registration plate lamp(s) (38% better than other pre-1990 cars)
    • 0.27% fail on Mandatory tell-tales
      • 0.20% fail on Rear fog lamp tell-tale
      • 0.078% fail on Main beam tell-tale
    • 0.14% fail on Hazard warning
      • 0.14% fail on Switch
    • 0.020% fail on Rear reflectors
  • 5.5% fail on Visibility
    • 4.6% fail on Washers
    • 1.0% fail on Wipers (58% better than other pre-1990 cars)
    • 0.098% fail on View to rear
      • 0.098% fail on Mirrors
    • 0.059% fail on Driver's view
    • 0.059% fail on Bonnet
    • 0.020% fail on Condition of glass
      • 0.020% fail on Windscreen
  • 4.0% fail on Brakes (58% better than other pre-1990 cars)
    • 3.2% fail on Brake performance (56% better than other pre-1990 cars)
      • 1.9% fail on Service brake performance (43% better than other pre-1990 cars)
        • 1.9% fail on Rbt (42% better than other pre-1990 cars)
          • 1.8% fail on Service brake performance (33% better than other pre-1990 cars)
          • 0.18% fail on Service brake imbalance (79% better than other pre-1990 cars)
        • 0.039% fail on Decelerometer
          • 0.039% fail on Service brake performance
      • 0.78% fail on Service Brake Efficiency (sp) (74% better than other pre-1990 cars)
        • 0.76% fail on Rbt (sp) (73% better than other pre-1990 cars)
          • 0.62% fail on Service brake performance (49% better than other pre-1990 cars)
          • 0.18% fail on Service brake imbalance (91% better than other pre-1990 cars)
        • 0.020% fail on Decelerometer (sp)
      • 0.68% fail on Parking brake efficiency (sp) (77% better than other pre-1990 cars)
        • 0.68% fail on Rbt (sp) (75% better than other pre-1990 cars)
      • 0.25% fail on Parking brake performance (79% better than other pre-1990 cars)
        • 0.21% fail on Rbt (82% better than other pre-1990 cars)
          • 0.18% fail on Parking brake performance (80% better than other pre-1990 cars)
          • 0.020% fail on Parking (secondary brake performance)
          • 0.020% fail on Parking brake efficiency (Trikes, quads and pre-68 vehicles)
        • 0.039% fail on Plate brake tester
          • 0.039% fail on Parking (secondary brake performance)
      • 0.16% fail on Brake performance not tested
    • 0.25% fail on Flexible brake hoses
    • 0.18% fail on Rigid brake pipes (86% better than other pre-1990 cars)
    • 0.16% fail on Mechanical brake components (83% better than other pre-1990 cars)
      • 0.078% fail on Brake linings and pads (81% better than other pre-1990 cars)
        • 0.078% fail on Brake pads (80% better than other pre-1990 cars)
      • 0.059% fail on Brake discs and drums (83% better than other pre-1990 cars)
        • 0.059% fail on Brake discs (79% better than other pre-1990 cars)
      • 0.039% fail on Brake cables, rods, levers and linkages (79% better than other pre-1990 cars)
        • 0.020% fail on Cable
        • 0.020% fail on Brake slack adjuster
    • 0.16% fail on ABS / EBS / ESC
      • 0.16% fail on Anti-lock braking system
    • 0.098% fail on Service brake pedal or hand lever (83% better than other pre-1990 cars)
      • 0.059% fail on Pedal (86% better than other pre-1990 cars)
      • 0.039% fail on Hand lever
    • 0.098% fail on Parking brake control (74% better than other pre-1990 cars)
      • 0.098% fail on Lever (74% better than other pre-1990 cars)
    • 0.098% fail on Brake actuators (including spring brakes or hydraulic cylinders) (68% better than other pre-1990 cars)
      • 0.078% fail on Hydraulic brake callipers
      • 0.020% fail on Hydraulic brake cylinder
    • 0.078% fail on Hydraulic systems (73% better than other pre-1990 cars)
      • 0.020% fail on Master cylinder
      • 0.020% fail on Reservoirs
      • 0.020% fail on Brake fluid
      • 0.020% fail on Valves
  • 2.6% fail on Body, chassis, structure (62% better than other pre-1990 cars)
    • 1.1% fail on Transmission
      • 1.1% fail on Drive shafts
        • 1.1% fail on Joints
      • 0.039% fail on Prop shafts (86% better than other pre-1990 cars)
        • 0.039% fail on Joints
    • 0.41% fail on Exhaust system (79% better than other pre-1990 cars)
    • 0.35% fail on Fuel system (62% better than other pre-1990 cars)
      • 0.25% fail on Fuel cap/sealing device
      • 0.039% fail on Tank
      • 0.039% fail on Hose
      • 0.020% fail on Pipe
    • 0.35% fail on Seats
      • 0.23% fail on Passenger's seat
      • 0.12% fail on Driver's seat (74% better than other pre-1990 cars)
    • 0.18% fail on Doors (66% better than other pre-1990 cars)
      • 0.098% fail on Driver's door
        • 0.098% fail on Door condition
      • 0.098% fail on Front passenger's door
        • 0.098% fail on Door condition
        • 0.020% fail on Catch
    • 0.16% fail on Integral vehicle structure (84% better than other pre-1990 cars)
      • 0.16% fail on Integral vehicle structure condition (84% better than other pre-1990 cars)
    • 0.078% fail on Chassis (93% better than other pre-1990 cars)
      • 0.078% fail on Chassis condition (92% better than other pre-1990 cars)
    • 0.059% fail on Floor
    • 0.020% fail on Body
      • 0.020% fail on Panel
    • 0.020% fail on Cabs
      • 0.020% fail on Prescribed areas
  • 2.6% fail on Suspension (69% better than other pre-1990 cars)
    • 1.2% fail on Anti-roll bars (87% worse than other pre-1990 cars)
      • 0.20% fail on Pins and bushes
      • 0.20% fail on Linkage pins and bushes
      • 0.18% fail on Attachment bracket and mounting
      • 0.18% fail on Ball joint dust cover (4 times worse than other pre-1990 cars)
      • 0.18% fail on Linkage ball joint dust cover (180% worse than other pre-1990 cars)
      • 0.14% fail on Linkage
      • 0.078% fail on Linkage ball joints
      • 0.078% fail on Linkage attachment bracket and mounting (5 times worse than other pre-1990 cars)
      • 0.039% fail on Anti-roll bar
      • 0.020% fail on Ball joint
    • 0.55% fail on Wheel bearings (64% better than other pre-1990 cars)
    • 0.45% fail on Component mounting prescribed areas (85% better than other pre-1990 cars)
    • 0.27% fail on Suspension arms (85% better than other pre-1990 cars)
      • 0.14% fail on Ball joint (79% better than other pre-1990 cars)
      • 0.078% fail on Ball joint dust cover (86% better than other pre-1990 cars)
      • 0.039% fail on Suspension arm
      • 0.039% fail on Pins and bushes (93% better than other pre-1990 cars)
    • 0.21% fail on Shock absorbers (68% better than other pre-1990 cars)
    • 0.078% fail on Sub-frames (84% better than other pre-1990 cars)
      • 0.039% fail on Sub-frame mounting prescribed areas (87% better than other pre-1990 cars)
      • 0.020% fail on Sub-frame
      • 0.020% fail on Attachment bracket and mounting
    • 0.059% fail on Macpherson strut
      • 0.059% fail on Macpherson strut
    • 0.039% fail on Other suspension component (92% better than other pre-1990 cars)
      • 0.039% fail on Attachment bracket and mounting
    • 0.020% fail on Suspension rods
      • 0.020% fail on Suspension rod
  • 2.3% fail on Noise, emissions and leaks (45% better than other pre-1990 cars)
    • 1.8% fail on Exhaust emissions (51% better than other pre-1990 cars)
      • 1.8% fail on Spark ignition (47% better than other pre-1990 cars)
        • 1.4% fail on Non catalyst emissions (47% better than other pre-1990 cars)
        • 0.21% fail on Catalyst emissions
        • 0.14% fail on Emissions not tested (62% better than other pre-1990 cars)
      • 0.020% fail on Compression ignition
        • 0.020% fail on Pre 01/07/2008 Turbo
    • 0.57% fail on Fluid leaks
      • 0.51% fail on Engine oil leaks
      • 0.039% fail on Other leaks
      • 0.020% fail on Transmission oil leaks
    • 0.039% fail on Noise suppression
      • 0.039% fail on Sound deadening material
  • 1.2% fail on Steering (69% better than other pre-1990 cars)
    • 0.43% fail on Steering linkage components (78% better than other pre-1990 cars)
      • 0.31% fail on Track rod end (74% better than other pre-1990 cars)
      • 0.098% fail on Locking devices
      • 0.020% fail on Other components
        • 0.020% fail on Steering linkage
    • 0.39% fail on Steering gear (68% better than other pre-1990 cars)
      • 0.39% fail on Steering rack (62% better than other pre-1990 cars)
    • 0.27% fail on Steering column
    • 0.12% fail on Steering wheel
    • 0.020% fail on Power steering
      • 0.020% fail on Pipes and hoses
    • 0.020% fail on Steering play
      • 0.020% fail on Steering rack
  • 1.00% fail on Tyres (36% better than other pre-1990 cars)
    • 0.55% fail on Condition
    • 0.47% fail on Tread depth
  • 0.72% fail on Identification of the vehicle
    • 0.72% fail on Registration plates
  • 0.70% fail on Seat belts and supplementary restraint systems (60% better than other pre-1990 cars)
    • 0.70% fail on Seat belts (60% better than other pre-1990 cars)
      • 0.51% fail on Prescribed areas (57% better than other pre-1990 cars)
      • 0.14% fail on Condition (68% better than other pre-1990 cars)
      • 0.039% fail on Requirements
      • 0.020% fail on Attachment
  • 0.020% fail on Speedometer and speed limiter
    • 0.020% fail on Speedometer
  • 0.020% fail on Road Wheels
    • 0.020% fail on Condition