1999 Vauxhall Omega — MOT failures & pass rate
489 MOT tests on the 1999 Vauxhall Omega are in this dataset, and 78.3% of them passed. Against executive cars of a similar age (23.3% fail rate), the 1999 Omega comes out 1.7pp better. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
One area stands out: lighting & signalling, recorded in 13.5% of tests against 8.0% for the next-worst category.
At component level the recurring items are catalyst emissions, rigid brake pipes and headlamp aim — catalyst emissions alone was recorded 43 times.
A 150k+ example is materially riskier than a 30-60k one: 23.9% versus 19.8%.
Brakes is the most common advisory, noted on 37.8% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 23.4% in 2021 to 20.4% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 13.5% | 66 |
| 2 | Brakes | 8.0% | 39 |
| 3 | Suspension | 7.6% | 37 |
| 4 | Emissions & environmental | 6.5% | 32 |
| 5 | Body, structure & corrosion | 5.9% | 29 |
| 6 | Visibility | 5.3% | 26 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Catalyst emissions | 43 |
| 2 | Rigid brake pipes | 37 |
| 3 | Headlamp aim | 35 |
| 4 | Wipers | 22 |
| 5 | Headlamp | 16 |
| 6 | Component mounting prescribed areas | 16 |
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 | 37.8% | 185 |
| 2 | Suspension | 28.0% | 137 |
| 3 | Tyres | 24.3% | 119 |
| 4 | Emissions & environmental | 21.3% | 104 |
| 5 | Body, structure & corrosion | 16.0% | 78 |
| 6 | Other defects | 9.6% | 47 |
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 | 96 | 19.8% |
| 60-90k | 135 | 21.5% |
| 90-120k | 114 | 22.8% |
| 120-150k | 77 | 20.8% |
| 150k+ | 67 | 23.9% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 440 | 21.8% |
| Diesel | 49 | 20.4% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 167 | 23.4% |
| 2022 | 112 | 21.4% |
| 2023 | 87 | 21.8% |
| 2024 | 69 | 18.8% |
| 2025 | 54 | 20.4% |
What to check before buying a 1999 Omega
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 13.5% of tests. Start there.
- Lighting & signalling (13.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (8.0% 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 (7.6% 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 1999 Vauxhall Omegas pass their MOT?
78.3% of the 489 1999 Vauxhall Omega MOT tests in this dataset passed — a 21.7% fail rate.
What is the most common MOT failure on a 1999 Vauxhall Omega?
Lighting & signalling, recorded in 13.5% of tests, followed by brakes (8.0%).
Does the 1999 Omega get worse with mileage?
Its MOT fail rate rises from 19.8% in the 30-60k band to 23.9% in the 150k+ band.
Methodology & source. Based on 489 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.