2003 Proton Jumbuck — MOT failures & pass rate
Across 497 MOT tests, the 2003 Proton Jumbuck recorded a 69.4% pass rate. Against all cars of a similar age (27.7% fail rate), the 2003 Jumbuck comes out 2.9pp worse. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
No single area dominates — lighting & signalling (15.7%) and brakes (13.7%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are component mounting prescribed areas, catalyst emissions and prescribed areas — component mounting prescribed areas alone was recorded 82 times.
A 120-150k example is materially riskier than a 30-60k one: 38.5% versus 27.9%.
Brakes is the most common advisory, noted on 30.0% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 30.9% in 2021 to 27.9% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 15.7% | 78 |
| 2 | Brakes | 13.7% | 68 |
| 3 | Suspension | 13.3% | 66 |
| 4 | Emissions & environmental | 10.9% | 54 |
| 5 | Body, structure & corrosion | 9.9% | 49 |
| 6 | Steering | 6.4% | 32 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Component mounting prescribed areas | 82 |
| 2 | Catalyst emissions | 67 |
| 3 | Prescribed areas | 42 |
| 4 | Integral vehicle structure condition | 32 |
| 5 | Rigid brake pipes | 31 |
| 6 | Wipers | 29 |
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 | 30.0% | 149 |
| 2 | Suspension | 29.0% | 144 |
| 3 | Emissions & environmental | 23.7% | 118 |
| 4 | Tyres | 23.3% | 116 |
| 5 | Body, structure & corrosion | 15.3% | 76 |
| 6 | Lighting & signalling | 14.5% | 72 |
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 | 147 | 27.9% |
| 60-90k | 195 | 31.3% |
| 90-120k | 74 | 33.8% |
| 120-150k | 52 | 38.5% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 139 | 30.9% |
| 2022 | 110 | 32.7% |
| 2023 | 104 | 31.7% |
| 2024 | 76 | 27.6% |
| 2025 | 68 | 27.9% |
What to check before buying a 2003 Jumbuck
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 15.7% of tests. Start there.
- Lighting & signalling (15.7% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (13.7% 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 (13.3% 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 2003 Proton Jumbucks pass their MOT?
69.4% of the 497 2003 Proton Jumbuck MOT tests in this dataset passed — a 30.6% fail rate.
What is the most common MOT failure on a 2003 Proton Jumbuck?
Lighting & signalling, recorded in 15.7% of tests, followed by brakes (13.7%).
Does the 2003 Jumbuck get worse with mileage?
Its MOT fail rate rises from 27.9% in the 30-60k band to 38.5% in the 120-150k band.
Methodology & source. Based on 497 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.