2004 Proton Jumbuck — MOT failures & pass rate
The 2004 Proton Jumbuck passed 69.3% of its 1,135 recorded MOT tests. Against all cars of a similar age (27.7% fail rate), the 2004 Jumbuck comes out 2.9pp worse. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
No single area dominates — lighting & signalling (15.2%) and suspension (14.4%) 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 173 times.
A 120-150k example is materially riskier than a 0-30k one: 37.8% versus 33.0%.
Advisories point at the next bill rather than this one: suspension was flagged on 30.3% of tests without failing them.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 15.2% | 172 |
| 2 | Suspension | 14.4% | 163 |
| 3 | Brakes | 12.2% | 138 |
| 4 | Emissions & environmental | 10.0% | 114 |
| 5 | Body, structure & corrosion | 9.1% | 103 |
| 6 | Steering | 7.1% | 81 |
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 | 173 |
| 2 | Catalyst emissions | 120 |
| 3 | Prescribed areas | 92 |
| 4 | Rigid brake pipes | 78 |
| 5 | Headlamp aim | 76 |
| 6 | Steering rack | 59 |
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 | 30.3% | 344 |
| 2 | Brakes | 28.5% | 324 |
| 3 | Emissions & environmental | 25.0% | 284 |
| 4 | Tyres | 22.3% | 253 |
| 5 | Body, structure & corrosion | 18.9% | 215 |
| 6 | Lighting & signalling | 15.5% | 176 |
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 | 88 | 33.0% |
| 30-60k | 302 | 27.8% |
| 60-90k | 452 | 29.4% |
| 90-120k | 239 | 34.3% |
| 120-150k | 45 | 37.8% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 301 | 30.9% |
| 2022 | 247 | 28.7% |
| 2023 | 231 | 29.9% |
| 2024 | 188 | 33.0% |
| 2025 | 168 | 31.6% |
What to check before buying a 2004 Jumbuck
On a 2004 Jumbuck, lighting & signalling is what the MOT record says goes wrong most — it appeared in 15.2% of tests. Check these areas before you commit.
- Lighting & signalling (15.2% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (14.4% 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 (12.2% 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 2004 Proton Jumbucks pass their MOT?
69.3% of the 1,135 2004 Proton Jumbuck MOT tests in this dataset passed — a 30.7% fail rate.
What is the most common MOT failure on a 2004 Proton Jumbuck?
Lighting & signalling, recorded in 15.2% of tests, followed by suspension (14.4%).
Does the 2004 Jumbuck get worse with mileage?
Its MOT fail rate rises from 33.0% in the 0-30k band to 37.8% in the 120-150k band.
Methodology & source. Based on 1,135 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.