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

Mercedes-Benz SL MOT Results

76.7% pass rate
from 832 tests in 2020
(14% 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 Mercedes-Benz SL is unusually good or bad.

  • 9.4% fail on Lamps, reflectors and electrical equipment (26% better than other pre-1990 cars)
    • 4.4% fail on Headlamp aim (32% worse than other pre-1990 cars)
      • 4.3% fail on Headlamp aim (38% worse than other pre-1990 cars)
      • 0.36% fail on Headlamp aim not tested (45% worse than other pre-1990 cars)
    • 1.9% fail on Headlamps (34% better than other pre-1990 cars)
      • 1.9% fail on Headlamp (31% better than other pre-1990 cars)
    • 1.8% fail on Direction indicators (32% better than other pre-1990 cars)
      • 1.8% fail on Flashing type (32% better than other pre-1990 cars)
        • 0.96% fail on All direction indicators (89% worse than other pre-1990 cars)
        • 0.84% fail on Individual direction indicators (46% better than other pre-1990 cars)
        • 0.12% fail on Side repeaters
    • 1.6% fail on Front and rear fog lamps (37% better than other pre-1990 cars)
      • 1.4% fail on Rear fog lamp (42% better than other pre-1990 cars)
        • 1.3% fail on Rear fog lamp (44% better than other pre-1990 cars)
        • 0.12% fail on Switch
      • 0.12% fail on Front fog lamps
        • 0.12% fail on Front fog lamp switch
    • 1.2% fail on Stop lamp (53% better than other pre-1990 cars)
    • 1.1% fail on Electrical equipment (51% better than other pre-1990 cars)
      • 0.60% fail on Horn (61% better than other pre-1990 cars)
      • 0.48% fail on Battery(ies) (18% better than other pre-1990 cars)
    • 0.24% fail on Position lamps (23% worse than other pre-1990 cars)
      • 0.12% fail on Position lamp
      • 0.12% fail on Switch
    • 0.24% fail on Registration plate lamp(s) (82% better than other pre-1990 cars)
    • 0.24% fail on Mandatory tell-tales (33% better than other pre-1990 cars)
      • 0.24% fail on Rear fog lamp tell-tale (8.6% better than other pre-1990 cars)
  • 6.5% fail on Suspension (17% better than other pre-1990 cars)
    • 4.1% fail on Component mounting prescribed areas (39% worse than other pre-1990 cars)
    • 1.3% fail on Suspension arms (28% better than other pre-1990 cars)
      • 0.84% fail on Ball joint dust cover (49% worse than other pre-1990 cars)
      • 0.24% fail on Suspension arm (89% worse than other pre-1990 cars)
      • 0.12% fail on Pins and bushes
      • 0.12% fail on Ball joint
    • 0.84% fail on Anti-roll bars (31% worse than other pre-1990 cars)
      • 0.36% fail on Attachment bracket and mounting (2 times worse than other pre-1990 cars)
      • 0.36% fail on Linkage pins and bushes (110% worse than other pre-1990 cars)
      • 0.12% fail on Linkage
    • 0.48% fail on Wheel bearings (66% better than other pre-1990 cars)
    • 0.36% fail on Shock absorbers (43% better than other pre-1990 cars)
    • 0.24% fail on Axles (31% better than other pre-1990 cars)
      • 0.12% fail on King pins
      • 0.12% fail on Swivel pins and bushes
    • 0.12% fail on Suspension rods
      • 0.12% fail on Pins and bushes
  • 6.3% fail on Brakes (32% better than other pre-1990 cars)
    • 3.6% fail on Brake performance (48% better than other pre-1990 cars)
      • 2.3% fail on Service brake performance (25% better than other pre-1990 cars)
        • 2.3% fail on Rbt (22% better than other pre-1990 cars)
          • 2.2% fail on Service brake performance (12% better than other pre-1990 cars)
          • 0.24% fail on Service brake imbalance (66% better than other pre-1990 cars)
      • 0.84% fail on Service Brake Efficiency (sp) (72% better than other pre-1990 cars)
        • 0.84% fail on Rbt (sp) (71% better than other pre-1990 cars)
          • 0.48% fail on Service brake imbalance (77% better than other pre-1990 cars)
          • 0.36% fail on Service brake performance (71% better than other pre-1990 cars)
      • 0.72% fail on Parking brake efficiency (sp) (75% better than other pre-1990 cars)
        • 0.72% fail on Rbt (sp) (72% better than other pre-1990 cars)
      • 0.12% fail on Parking brake performance
        • 0.12% fail on Rbt
          • 0.12% fail on Parking brake performance
    • 1.1% fail on Rigid brake pipes (4.8% better than other pre-1990 cars)
    • 0.60% fail on Mechanical brake components (35% better than other pre-1990 cars)
      • 0.60% fail on Brake linings and pads (40% worse than other pre-1990 cars)
        • 0.60% fail on Brake pads (47% worse than other pre-1990 cars)
    • 0.48% fail on ABS / EBS / ESC (3 times worse than other pre-1990 cars)
      • 0.48% fail on Anti-lock braking system (3 times worse than other pre-1990 cars)
    • 0.36% fail on Flexible brake hoses (6.9% better than other pre-1990 cars)
    • 0.36% fail on Other components and prescribed areas (70% worse than other pre-1990 cars)
      • 0.24% fail on Prescribed areas (32% worse than other pre-1990 cars)
        • 0.12% fail on Master cylinder/servo mounting
        • 0.12% fail on Other braking system component
      • 0.12% fail on Other components
    • 0.24% fail on Parking brake control (29% better than other pre-1990 cars)
      • 0.24% fail on Lever (29% better than other pre-1990 cars)
    • 0.24% fail on Brake actuators (including spring brakes or hydraulic cylinders) (21% better than other pre-1990 cars)
      • 0.24% fail on Hydraulic brake callipers (80% worse than other pre-1990 cars)
    • 0.12% fail on Service brake pedal or hand lever
      • 0.12% fail on Hand lever
  • 5.8% fail on Body, chassis, structure (13% better than other pre-1990 cars)
    • 2.2% fail on Exhaust system (8.5% worse than other pre-1990 cars)
    • 1.8% fail on Integral vehicle structure (77% worse than other pre-1990 cars)
      • 1.8% fail on Integral vehicle structure condition (80% worse than other pre-1990 cars)
      • 0.12% fail on Strengthening plate
    • 0.72% fail on Chassis (28% better than other pre-1990 cars)
      • 0.72% fail on Chassis condition (27% better than other pre-1990 cars)
    • 0.72% fail on Fuel system (5.4% better than other pre-1990 cars)
      • 0.60% fail on Pipe (120% worse than other pre-1990 cars)
      • 0.12% fail on Hose
    • 0.48% fail on Cabs (4 times worse than other pre-1990 cars)
      • 0.48% fail on Prescribed areas (5 times worse than other pre-1990 cars)
    • 0.36% fail on Seats (39% better than other pre-1990 cars)
      • 0.24% fail on Passenger's seat (7.6% better than other pre-1990 cars)
      • 0.12% fail on Driver's seat
    • 0.24% fail on Floor (23% worse than other pre-1990 cars)
    • 0.12% fail on Transmission
      • 0.12% fail on Prop shafts
        • 0.12% fail on Flexible couplings
    • 0.12% fail on Body
      • 0.12% fail on Other body component
    • 0.12% fail on Doors
      • 0.12% fail on Front passenger's door
        • 0.12% fail on Door condition
  • 5.0% fail on Visibility (19% better than other pre-1990 cars)
    • 3.6% fail on Washers (14% better than other pre-1990 cars)
    • 1.8% fail on Wipers (26% better than other pre-1990 cars)
    • 0.12% fail on Driver's view
    • 0.12% fail on Bonnet
  • 3.6% fail on Noise, emissions and leaks (13% better than other pre-1990 cars)
    • 3.1% fail on Exhaust emissions (14% better than other pre-1990 cars)
      • 3.1% fail on Spark ignition (7.2% better than other pre-1990 cars)
        • 2.2% fail on Non catalyst emissions (21% better than other pre-1990 cars)
        • 0.84% fail on Emissions not tested (130% worse than other pre-1990 cars)
        • 0.24% fail on Catalyst emissions (19% better than other pre-1990 cars)
    • 0.24% fail on Noise suppression (25 times worse than other pre-1990 cars)
      • 0.24% fail on Sound deadening material (29 times worse than other pre-1990 cars)
    • 0.24% fail on Fluid leaks (61% better than other pre-1990 cars)
      • 0.12% fail on Engine oil leaks
      • 0.12% fail on Hydraulic fluid leaks
  • 2.0% fail on Steering (45% better than other pre-1990 cars)
    • 1.6% fail on Steering linkage components (21% better than other pre-1990 cars)
      • 0.96% fail on Track rod end (22% better than other pre-1990 cars)
      • 0.36% fail on Drag link end (17% worse than other pre-1990 cars)
      • 0.12% fail on Ball joint
      • 0.12% fail on Other components
        • 0.12% fail on Steering linkage
    • 0.24% fail on Power steering (30% better than other pre-1990 cars)
      • 0.12% fail on Pipes and hoses
      • 0.12% fail on Other components
    • 0.12% fail on Steering gear
      • 0.12% fail on Steering box
    • 0.12% fail on Prescribed areas
  • 1.3% fail on Tyres (5.1% better than other pre-1990 cars)
    • 0.72% fail on Condition (1.0% better than other pre-1990 cars)
    • 0.60% fail on Tread depth (4.7% better than other pre-1990 cars)
  • 1.2% fail on Seat belts and supplementary restraint systems (27% better than other pre-1990 cars)
    • 1.2% fail on Seat belts (26% better than other pre-1990 cars)
      • 0.72% fail on Prescribed areas (31% better than other pre-1990 cars)
      • 0.48% fail on Condition (10.0% worse than other pre-1990 cars)
      • 0.12% fail on Attachment
  • 0.48% fail on Identification of the vehicle (24% better than other pre-1990 cars)
    • 0.48% fail on Registration plates (21% better than other pre-1990 cars)
  • 0.12% fail on Speedometer and speed limiter
    • 0.12% fail on Speedometer