2000 Mercedes-Benz SLK — MOT failures & pass rate
Across 12,123 MOT tests, the 2000 Mercedes-Benz SLK recorded an 80.1% pass rate. Against coupes & convertibles of a similar age (22.4% fail rate), the 2000 SLK comes out 2.5pp better. Failures cluster in lighting & signalling, brakes and visibility.
What the MOT record shows
One area stands out: lighting & signalling, recorded in 14.5% of tests against 6.4% for the next-worst category.
At component level the recurring items are headlamp aim, stop lamp and headlamp — headlamp aim alone was recorded 783 times.
Mileage is the strongest signal on the record: 7.8% of 0-30k cars fail, rising to 27.5% once past 150k — 3.5× the risk.
Brakes is the most common advisory, noted on 31.4% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 21.0% in 2021 to 19.0% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 14.5% | 1,761 |
| 2 | Brakes | 6.4% | 781 |
| 3 | Visibility | 5.9% | 720 |
| 4 | Suspension | 5.0% | 610 |
| 5 | Tyres | 3.9% | 470 |
| 6 | Emissions & environmental | 3.1% | 379 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 783 |
| 2 | Stop lamp | 596 |
| 3 | Headlamp | 484 |
| 4 | Washers | 468 |
| 5 | Position lamp | 414 |
| 6 | Rigid brake pipes | 382 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Brakes | 31.4% | 3,812 |
| 2 | Suspension | 28.3% | 3,432 |
| 3 | Tyres | 24.2% | 2,931 |
| 4 | Lighting & signalling | 11.8% | 1,436 |
| 5 | Other defects | 11.4% | 1,387 |
| 6 | Emissions & environmental | 10.8% | 1,315 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 334 | 7.8% |
| 30-60k | 1,964 | 13.3% |
| 60-90k | 3,765 | 17.8% |
| 90-120k | 3,678 | 22.2% |
| 120-150k | 1,763 | 26.3% |
| 150k+ | 597 | 27.5% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 3,029 | 21.0% |
| 2022 | 2,774 | 19.1% |
| 2023 | 2,441 | 19.6% |
| 2024 | 2,099 | 20.4% |
| 2025 | 1,780 | 19.0% |
What to check before buying a 2000 SLK
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 14.5% of tests. Start there.
- Lighting & signalling (14.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (6.4% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
- Visibility (5.9% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£150.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 2000 Mercedes-Benz SLKs pass their MOT?
80.1% of the 12,123 2000 Mercedes-Benz SLK MOT tests in this dataset passed — a 19.9% fail rate.
What is the most common MOT failure on a 2000 Mercedes-Benz SLK?
Lighting & signalling, recorded in 14.5% of tests, followed by brakes (6.4%).
Does the 2000 SLK get worse with mileage?
Its MOT fail rate rises from 7.8% in the 0-30k band to 27.5% in the 150k+ band.
Methodology & source. Based on 12,123 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.