2000 Mercedes-Benz Sl — MOT failures & pass rate
The 2000 Mercedes-Benz Sl passed 86.3% of its 2,836 recorded MOT tests. Against coupes & convertibles of a similar age (22.3% fail rate), the 2000 Sl comes out 8.6pp better. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
Lighting & signalling dominates the failure mix at 8.2% of all tests — 3.8 points clear of suspension, so it is the first thing to check.
At component level the recurring items are ball joint dust cover, headlamp aim and stop lamp — ball joint dust cover alone was recorded 109 times.
Mileage is the strongest signal on the record: 5.5% of 0-30k cars fail, rising to 16.7% once past 150k — 3.0× the risk.
Advisories point at the next bill rather than this one: suspension was flagged on 26.2% of tests without failing them.
The trend is improving — the fail rate fell from 14.2% in 2021 to 12.6% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 8.2% | 231 |
| 2 | Suspension | 4.4% | 124 |
| 3 | Brakes | 3.2% | 90 |
| 4 | Visibility | 2.9% | 81 |
| 5 | Tyres | 2.6% | 73 |
| 6 | Emissions & environmental | 1.9% | 55 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Ball joint dust cover | 109 |
| 2 | Headlamp aim | 74 |
| 3 | Stop lamp | 65 |
| 4 | Side repeaters | 62 |
| 5 | Headlamp | 49 |
| 6 | Wipers | 42 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 26.2% | 742 |
| 2 | Brakes | 23.9% | 679 |
| 3 | Tyres | 15.9% | 450 |
| 4 | Emissions & environmental | 11.4% | 324 |
| 5 | Lighting & signalling | 7.5% | 213 |
| 6 | Steering | 5.9% | 166 |
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 | 128 | 5.5% |
| 30-60k | 615 | 11.2% |
| 60-90k | 990 | 13.0% |
| 90-120k | 669 | 16.1% |
| 120-150k | 308 | 18.2% |
| 150k+ | 126 | 16.7% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 605 | 14.2% |
| 2022 | 598 | 13.9% |
| 2023 | 565 | 13.8% |
| 2024 | 544 | 14.1% |
| 2025 | 524 | 12.6% |
What to check before buying a 2000 Sl
On a 2000 Sl, lighting & signalling is what the MOT record says goes wrong most — it appeared in 8.2% of tests. Check these areas before you commit.
- Lighting & signalling (8.2% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (4.4% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
- Brakes (3.2% 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.
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 Sls pass their MOT?
86.3% of the 2,836 2000 Mercedes-Benz Sl MOT tests in this dataset passed — a 13.8% fail rate.
What is the most common MOT failure on a 2000 Mercedes-Benz Sl?
Lighting & signalling, recorded in 8.2% of tests, followed by suspension (4.4%).
Does the 2000 Sl get worse with mileage?
Its MOT fail rate rises from 5.5% in the 0-30k band to 16.7% in the 150k+ band.
Methodology & source. Based on 2,836 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.