2006 Mercedes-Benz R-Class — MOT failures & pass rate
Across 2,304 MOT tests, the 2006 Mercedes-Benz R-Class recorded a 79.0% pass rate. Against MPVs of a similar age (29.7% fail rate), the 2006 R-Class comes out 8.7pp better. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
No single area dominates — lighting & signalling (12.5%) and brakes (10.7%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are rigid brake pipes, position lamp and joints — rigid brake pipes alone was recorded 123 times.
Mileage is the strongest signal on the record: 18.6% of 30-60k cars fail, rising to 23.2% once past 150k.
Split by fuel, diesel examples fail 4.1pp more often than petrol ones (22.0% vs 17.9%) — worth weighing if you have a choice.
Advisories point at the next bill rather than this one: brakes was flagged on 34.4% of tests without failing them.
The trend is improving — the fail rate fell from 21.3% in 2021 to 15.8% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 12.5% | 287 |
| 2 | Brakes | 10.7% | 246 |
| 3 | Suspension | 5.0% | 115 |
| 4 | Emissions & environmental | 4.7% | 108 |
| 5 | Body, structure & corrosion | 4.1% | 95 |
| 6 | Tyres | 3.8% | 87 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Rigid brake pipes | 123 |
| 2 | Position lamp | 102 |
| 3 | Joints | 97 |
| 4 | Headlamp aim | 88 |
| 5 | Flexible brake hoses | 79 |
| 6 | Stop lamp | 74 |
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 | 34.4% | 792 |
| 2 | Emissions & environmental | 26.2% | 603 |
| 3 | Tyres | 24.8% | 571 |
| 4 | Suspension | 21.8% | 503 |
| 5 | Body, structure & corrosion | 12.7% | 293 |
| 6 | Lighting & signalling | 12.3% | 284 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 30-60k | 70 | 18.6% |
| 60-90k | 279 | 18.3% |
| 90-120k | 696 | 20.8% |
| 120-150k | 694 | 20.8% |
| 150k+ | 552 | 23.2% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Diesel | 1,729 | 22.0% |
| Petrol | 575 | 17.9% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 676 | 21.3% |
| 2022 | 562 | 22.1% |
| 2023 | 452 | 19.9% |
| 2024 | 368 | 23.6% |
| 2025 | 246 | 15.8% |
What to check before buying a 2006 R-Class
On a 2006 R-Class, lighting & signalling is what the MOT record says goes wrong most — it appeared in 12.5% of tests. Check these areas before you commit.
- Lighting & signalling (12.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (10.7% 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.
- Suspension (5.0% 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.
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 2006 Mercedes-Benz R-Classs pass their MOT?
79.0% of the 2,304 2006 Mercedes-Benz R-Class MOT tests in this dataset passed — a 21.0% fail rate.
What is the most common MOT failure on a 2006 Mercedes-Benz R-Class?
Lighting & signalling, recorded in 12.5% of tests, followed by brakes (10.7%).
Does the 2006 R-Class get worse with mileage?
Its MOT fail rate rises from 18.6% in the 30-60k band to 23.2% in the 150k+ band.
Methodology & source. Based on 2,304 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.