2009 Mercedes-Benz SLK MOT pass rate, common failures & what to check
In 2025, 69.3% of Mercedes-Benz SLKs first used in 2009 passed their MOT first time, against 58.3% for all cars first used in 2009. Across 7,442 SLK first tests from 2023 to 2025, the most common failure areas were suspension, brakes and lamps and electrical equipment.
This page analyses first MOT tests for Mercedes-Benz SLKs first used in 2009 (all trims grouped): 2021 to 2025 for the pass-rate trend, and 2023 to 2025 for the failure and advisory analysis — plus what is worth checking before you buy one.
Data: DVSA anonymised MOT tests to December 2025 · Calculated by SortedCars · Updated October 2026
How the 2009 Mercedes-Benz SLK MOT pass rate has changed
Share of first tests passed in each year, SLKs first used in 2009 against all cars first used in 2009 (any make or fuel; not adjusted for mileage, fuel or use). In 2025 the SLK figure was 11.0 points higher.
View this chart as a table
| Test year | 2009 SLK | All cars first used 2009 | SLK first tests |
|---|---|---|---|
| 2021 | 70.9% | 60.5% | 2,564 |
| 2022 | 70.6% | 60.1% | 2,542 |
| 2023 | 67.7% | 59.0% | 2,516 |
| 2024 | 70.6% | 58.4% | 2,477 |
| 2025 | 69.3% | 58.3% | 2,449 |
Common 2009 Mercedes-Benz SLK MOT failures
Share of the 2,293 failed first tests (2023–2025) with at least one failure in each area. A test can fail in more than one area, so the shares add up to more than 100%.
Most common failure items
| DVSA failure item | Share of failed first tests | Tests |
|---|---|---|
| Coil spring: fractured or broken | 23.7% | 543 |
| Ball joint: excessively worn | 16.8% | 386 |
| Parking brake efficiency (sp): efficiency below requirements | 7.8% | 179 |
| Rigid brake pipes: excessively corroded | 7.6% | 175 |
| Tread depth: below requirements of 1.6mm | 6.8% | 155 |
Item names are DVSA’s own wording. 2023–2025 combined.
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Typical repair costs for common MOT failures
Typical UK garage prices for the job, not for an SLK in particular, and not a quote.
| Failure item | Typical job | Typical UK price | Usual range |
|---|---|---|---|
| Coil spring: fractured or broken | Coil spring replacement | £248 | £175–£400 |
| Ball joint: excessively worn | Ball joint replacement | £90 | £60–£150 |
From published UK repair-cost guides, checked September 2026. Only jobs with a published typical price are shown.
What to check on a 2009 Mercedes-Benz SLK before buying
The three areas where failed first tests most often had a fault, 2023–2025.
- Suspension. Worth looking behind the front wheels with a torch at the coil springs, and listening for knocks over bumps on the test drive.
- Brakes. Worth looking at the discs and pads through the wheel spokes for scoring and a worn lip, and noticing on the test drive whether the car pulls to one side or the pedal feels long.
- Lamps and electrics. Ask someone to watch while you work the brake lights, indicators, sidelights, dipped and main beam, and the number-plate lamps.
Common 2009 Mercedes-Benz SLK MOT advisories
Advisories are points the tester noted that did not fail the car. Most common on 2009 SLKs, as a share of all 7,442 first tests, 2023–2025.
| DVSA advisory item | Share of first tests | Tests |
|---|---|---|
| Tread depth: worn close to legal limit/worn on edge | 14.2% | 1,057 |
| Rigid brake pipes: corroded, covered in grease or other material | 14.2% | 1,055 |
| Tyre condition: slightly damaged/cracking or perishing | 8.9% | 666 |
| Brake discs: worn, pitted or scored, but not seriously weakened | 7.2% | 538 |
| Suspension arm pins and bushes: pin or bush worn but not resulting in excessive movement | 6.7% | 496 |
Questions about the 2009 Mercedes-Benz SLK MOT
What is the MOT pass rate of a 2009 Mercedes-Benz SLK?
In 2025, 69.3% of SLKs first used in 2009 passed their MOT first time, against 58.3% for all cars first used in 2009. A car fixed during the test counts as a fail.
What does a 2009 SLK most often fail its MOT on?
Suspension (in 49.5% of failed first tests, 2023–2025), brakes (25.5%) and lamps and electrical equipment (25.4%). The single most common item was “Coil spring: fractured or broken” (23.7%).
How often does a 2009 Mercedes-Benz SLK fail its MOT?
In 2025, 30.7% of first tests on SLKs first used in 2009 did not pass first time: 27.7% failed, and a further 3.0% had a fault fixed during the test (counted as a fail here). Across 2023–2025, 2,293 of 7,442 first tests did not pass first time.
What are the most common 2009 Mercedes-Benz SLK MOT advisories?
“Tread depth: worn close to legal limit/worn on edge” (on 14.2% of first tests, 2023–2025), “Rigid brake pipes: corroded, covered in grease or other material” (14.2%), “Tyre condition: slightly damaged/cracking or perishing” (8.9%), “Brake discs: worn, pitted or scored, but not seriously weakened” (7.2%) and “Suspension arm pins and bushes: pin or bush worn but not resulting in excessive movement” (6.7%).
Is a 2009 Mercedes-Benz SLK reliable?
An MOT pass rate shows what failed at the test, not how reliable a car is. For this group of cars the first-time pass rate went from 70.9% in 2021 to 69.3% in 2025. For one particular car, its own MOT history matters more than the average.
Other cars first used in 2009
The most-tested cars from the same year. Each page uses the same method.
2009 Ford Fiesta MOT statistics · 2009 Ford Focus MOT statistics · 2009 Vauxhall Corsa MOT statistics · 2009 Volkswagen Golf MOT statistics · 2009 Vauxhall Astra MOT statistics
Checking a specific 2009 SLK?
The numbers above cover every SLK first used in 2009 and tested in Great Britain. Our free check shows the actual MOT history, mileage record and tax status of the one you are looking at.
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