2020 · 4 years old at test · Petrol mostly

2020 Mercedes-Benz SLC MOT pass rate and common faults

584 MOT tests in 2024. 91.6% passed first time, compared with 86.9% for all cars the same age.

105Above average
Passed first time91.6%
Failed or needed repairs8.4%
Typical mileage at test16,000

Most common reasons for failing

Share of all 584 tests where this item caused a failure.

  1. Tyres - condition: has ply or cords exposed1.4%
    13 marked dangerous
  2. Tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.0%
  3. Tyres - condition: has a bulge, caused by separation or partial failure of its structure1.0%
    6 marked dangerous
  4. Headlamp aim: too high0.7%
  5. Registration plates: does not conform to the specified requirements0.5%
  6. Tyres - condition: has a tear, caused by separation or partial failure of its structure0.5%
    6 marked dangerous
  7. Catalyst emissions: Lambda reading after 2nd fast idle outside specified limits0.5%
  8. Tyre pressure monitoring system: malfunctioning or obviously inoperative0.3%
  9. Suspension arms - ball joint: ball joint excessively worn0.3%
  10. Tread depth below requirements of 1.6mm0.3%
    3 marked dangerous

Problem areas

Failure items found per 100 tests, by part of the car.

  1. Tyres5.0%
  2. Lights & electrics1.5%
  3. Suspension0.7%
  4. Number plates & VIN0.5%
  5. Emissions & leaks0.5%
  6. Wheels0.3%
  7. Visibility (wipers, screen, mirrors)0.3%
  8. Brakes0.2%

Most common advisories

Not failures yet, but things the tester warned about.

  1. Tread depth below requirements of 1.6mm8.9%
  2. Tyres - condition: has a tear, caused by separation or partial failure of its structure6.0%
  3. Tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords3.1%
  4. Tread depth: tread pattern not visible over the whole tread area when minimum depth required is 1.0mm1.5%
  5. Brake pads: less than 1.5 mm thick1.4%

What this means if you are buying one

This model year does better than most cars its age, so it is a reasonable used buy on MOT record alone. Before buying, check the area that fails most: tyres - condition: has ply or cords exposed. Then look up the car's own MOT history on GOV.UK with its number plate, and look for repeat advisories.

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Questions

What is the MOT pass rate for a 2020 Mercedes-Benz SLC?

In 2024, 91.6% of 2020 Mercedes-Benz SLC cars passed their MOT first time, across 584 tests. The average for all 4-year-old cars was 86.9%.

What are the most common MOT failures on a 2020 Mercedes-Benz SLC?

The most common failure reasons were tyres - condition: has ply or cords exposed; tyres - condition: has a cut in excess of the requirements deep enough to reach the ply or cords; tyres - condition: has a bulge, caused by separation or partial failure of its structure. The biggest problem area was tyres.

Is the 2020 Mercedes-Benz SLC reliable at MOT time?

Its MOT Rank score is 105, which is above average for a car of its age (100 means exactly average).