1998 Vauxhall Omega — MOT failures & pass rate
Across 280 MOT tests, the 1998 Vauxhall Omega recorded a 74.6% pass rate. Executive cars of a similar age fail 22.9% of the time, so this is 2.4pp worse than the group it competes with. Failures cluster in brakes, suspension and lighting & signalling.
What the MOT record shows
No single area dominates — brakes (10.4%) and suspension (10.4%) 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 rigid brake pipes — component mounting prescribed areas alone was recorded 30 times.
Mileage is the strongest signal on the record: 7.9% of 30-60k cars fail, rising to 29.8% once past 150k — 3.8× the risk.
Advisories point at the next bill rather than this one: brakes was flagged on 37.5% of tests without failing them.
The trend is improving — the fail rate fell from 26.2% in 2021 to 17.6% in 2024, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Brakes | 10.4% | 29 |
| 2 | Suspension | 10.4% | 29 |
| 3 | Lighting & signalling | 8.6% | 24 |
| 4 | Emissions & environmental | 7.9% | 22 |
| 5 | Body, structure & corrosion | 7.5% | 21 |
| 6 | Visibility | 7.1% | 20 |
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 | 30 |
| 2 | Catalyst emissions | 22 |
| 3 | Rigid brake pipes | 18 |
| 4 | Washers | 15 |
| 5 | Exhaust system | 13 |
| 6 | Headlamp aim | 12 |
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 | 37.5% | 105 |
| 2 | Tyres | 29.3% | 82 |
| 3 | Suspension | 24.3% | 68 |
| 4 | Body, structure & corrosion | 21.1% | 59 |
| 5 | Emissions & environmental | 18.6% | 52 |
| 6 | Other defects | 14.6% | 41 |
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 | 38 | 7.9% |
| 60-90k | 91 | 27.5% |
| 90-120k | 63 | 27.0% |
| 120-150k | 40 | 30.0% |
| 150k+ | 47 | 29.8% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 233 | 27.0% |
| Diesel | 47 | 17.0% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 84 | 26.2% |
| 2022 | 82 | 30.5% |
| 2023 | 58 | 29.3% |
| 2024 | 34 | 17.6% |
What to check before buying a 1998 Omega
On a 1998 Omega, brakes is what the MOT record says goes wrong most — it appeared in 10.4% of tests. Check these areas before you commit.
- Brakes (10.4% 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 (10.4% 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.
- Lighting & signalling (8.6% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
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 1998 Vauxhall Omegas pass their MOT?
74.6% of the 280 1998 Vauxhall Omega MOT tests in this dataset passed — a 25.4% fail rate.
What is the most common MOT failure on a 1998 Vauxhall Omega?
Brakes, recorded in 10.4% of tests, followed by suspension (10.4%).
Does the 1998 Omega get worse with mileage?
Its MOT fail rate rises from 7.9% in the 30-60k band to 29.8% in the 150k+ band.
Methodology & source. Based on 280 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.