MOT performance
Mercedes-Benz SLK MOT pass rate and common failures
Across 133,811 MOT tests of the Mercedes-Benz SLK in 2023–2024, 74.2% passed first time. Allowing for age, mileage and fuel, Mercedes-Benz SLKs failed 18% less often than comparable cars. The most common failure item was “coil spring: fractured or broken”, on 4.51% of tests.
133,811 MOT tests on 68,616 vehicles, 2023–2024 · Source: DVSA (Open Government Licence) · Analysis: 73 Auto
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| Figure | Value | Basis |
|---|---|---|
| First-time pass rate | 74.2% | ±0.2 pts (95%), n = 133,811 |
| Failures vs similar cars | 0.82× | same age, mileage and fuel = 1.00 |
| Tests with a dangerous defect | 6.7% | n = 133,811 |
| Average age at test | 13.5 years | n = 133,811 |
| Median mileage at test | 60,076 miles | n = 133,811 |
| Vehicles tested | 68,616 | 2023–2024 |
Where Mercedes-Benz SLKs fail
The share of MOT tests that failed on each area, and how that compares with cars of the same age, mileage and fuel. Areas where the difference is large and clear link to their own page.
| Area | Tests failed on it | vs similar cars |
|---|---|---|
| Suspension | 10.3% | Same |
| Lights, reflectors and electrical | 7.6% | -42% |
| Tyres | 6.3% | +11% |
| Brakes | 5.6% | -29% |
| Driver's view of the road | 2.9% | -46% |
| Noise, emissions and leaks | 2.4% | -43% |
| Body, chassis and structure | 1.3% | -72% |
| Seat belts and airbags | 1.1% | -16% |
| Steering | 0.8% | -61% |
| Road wheels | 0.4% | +40% |
| Registration plates and VIN | 0.4% | -13% |
| Speedometer and driving controls | 0.0% | -40% |
Mercedes-Benz SLK MOT pass rate by fuel: petrol vs diesel
Raw pass rates partly reflect how old each fuel's cars are; the adjusted column compares each with cars of the same age, mileage and fuel. Fuels that differ materially from the model as a whole have their own page.
| Fuel | Tests | Average age | First-time pass | vs similar cars |
|---|---|---|---|---|
| Petrol | 101,318 | 15.1 yrs | 73.0% | -20% |
| Diesel | 32,488 | 8.7 yrs | 77.8% | -7% |
Most common failure items
| Item | Area | Share of tests |
|---|---|---|
| Coil spring: fractured or broken | Suspension | 4.51% |
| Ball joint: ball joint excessively worn | Suspension | 2.36% |
| Tread depth: tread depth below requirements of 1.6mm | Tyres | 2.08% |
| Condition: has ply or cords exposed | Tyres | 1.78% |
| Rigid brake pipes: excessively corroded | Brakes | 1.38% |
| Condition: has a cut in excess of the requirements deep enough to reach the ply or cords | Tyres | 1.35% |
| Stop lamp: not working | Lights, reflectors and electrical | 1.28% |
| Malfunction indicator lamp: inoperative or indicates a malfunction | Noise, emissions and leaks | 1.28% |
| Position lamp: not working | Lights, reflectors and electrical | 1.17% |
| Wipers: does not clear the windscreen effectively | Driver's view of the road | 1.10% |
Most common advisories
Advisories are items the tester expects to need attention soon; they don't fail the test.
| Item | Area | Share of tests |
|---|---|---|
| Tread depth: tread depth below requirements of 1.6mm | Tyres | 14.44% |
| Rigid brake pipes: excessively corroded | Brakes | 9.79% |
| Condition: has a tear, caused by separation or partial failure of its structure | Tyres | 7.91% |
| Brake discs: in such a condition that it is seriously weakened | Brakes | 6.98% |
| Brake pads: less than 1.5 mm thick | Brakes | 4.59% |
Pass rate by age
| Age at test (years) | Tests | First-time pass rate | Failures vs similar cars |
|---|---|---|---|
| 3-4 | 3,424 | 91.4% | -20% |
| 5-6 | 9,869 | 86.5% | -10% |
| 7-8 | 16,294 | 82.7% | -12% |
| 9-10 | 19,611 | 77.9% | -16% |
| 11-12 | 15,639 | 75.1% | -21% |
| 13-15 | 15,533 | 69.6% | -20% |
| 16+ | 52,803 | 67.6% | -19% |
Pass rate by registration year
| Registered | Tests | First-time pass rate | Failures vs similar cars |
|---|---|---|---|
| 2020 | 1,183 | 91.4% | 0.91× |
| 2019 | 1,994 | 91.9% | 0.76× |
| 2018 | 3,007 | 89.1% | 0.82× |
| 2017 | 6,915 | 85.3% | 0.94× |
| 2016 | 7,045 | 84.4% | 0.87× |
| 2015 | 9,718 | 81.7% | 0.87× |
| 2014 | 9,739 | 79.5% | 0.84× |
| 2013 | 9,166 | 76.0% | 0.86× |
| 2012 | 11,112 | 75.7% | 0.80× |
| 2011 | 5,051 | 77.2% | 0.71× |
| 2010 | 4,177 | 70.3% | 0.84× |
| 2009 | 4,986 | 69.2% | 0.83× |
| 2008 | 6,411 | 68.5% | 0.80× |
| 2007 | 7,054 | 68.0% | 0.80× |
| 2006 | 7,480 | 68.1% | 0.78× |
| 2005 | 9,729 | 67.0% | 0.80× |
| 2004 | 6,262 | 65.2% | 0.84× |
| 2003 | 3,594 | 65.3% | 0.84× |
| 2002 | 3,982 | 69.9% | 0.74× |
| 2001 | 4,453 | 69.2% | 0.77× |
| 2000 | 3,825 | 68.7% | 0.81× |
| 1999 | 2,986 | 68.6% | 0.89× |
| 1998 | 2,174 | 67.8% | 1.02× |
| 1997 | 1,452 | 67.5% | 1.10× |
Years with fewer tests are shown for completeness; only years with enough tests have their own page.
Compared with similar models
Check a specific Mercedes-Benz SLK
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About this data. These are MOT test results, not a measure of mechanical reliability: a car's MOT outcome reflects its condition on the day, which depends on how it has been maintained and driven as well as how it was built. Figures cover class 4 vehicles (cars and light vans), normal tests only (retests excluded), outcomes pass, fail and pass after rectification at the station; vehicles at least 2.5 years old at test. Tests from 2023-01-01 to 2024-12-30. “Compared with similar cars” means compared with the national rate for cars of the same age, mileage band and fuel. Contains public sector information licensed under the Open Government Licence v3.0. Makes and models are matched to 73 Auto's vehicle catalogue; tests that can't be matched are left out rather than guessed. See how the MOT figures are produced.