1998 BMW 7 Series — MOT failures & pass rate
The 1998 BMW 7 Series passed 79.1% of its 1,686 recorded MOT tests. Against executive cars of a similar age (22.7% fail rate), the 1998 7 Series comes out 1.8pp better. Failures cluster in suspension, lighting & signalling and brakes.
What the MOT record shows
No single area dominates — suspension (10.6%) and lighting & signalling (9.1%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are catalyst emissions, ball joint dust cover and ball joint — catalyst emissions alone was recorded 120 times.
A 150k+ example is materially riskier than a 0-30k one: 20.9% versus 26.9%.
Brakes is the most common advisory, noted on 33.4% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 22.9% in 2021 to 18.4% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 10.6% | 179 |
| 2 | Lighting & signalling | 9.1% | 154 |
| 3 | Brakes | 8.3% | 140 |
| 4 | Visibility | 4.9% | 83 |
| 5 | Emissions & environmental | 4.9% | 82 |
| 6 | Tyres | 3.4% | 57 |
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 | 120 |
| 2 | Ball joint dust cover | 76 |
| 3 | Ball joint | 71 |
| 4 | Headlamp aim | 67 |
| 5 | Rigid brake pipes | 66 |
| 6 | Pins and bushes | 61 |
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 | 33.4% | 563 |
| 2 | Suspension | 31.3% | 528 |
| 3 | Emissions & environmental | 23.7% | 400 |
| 4 | Tyres | 18.9% | 318 |
| 5 | Steering | 10.3% | 174 |
| 6 | Other defects | 9.7% | 164 |
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 | 93 | 26.9% |
| 30-60k | 68 | 16.2% |
| 60-90k | 170 | 14.7% |
| 90-120k | 375 | 20.3% |
| 120-150k | 395 | 20.0% |
| 150k+ | 441 | 20.9% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 411 | 22.9% |
| 2022 | 373 | 22.0% |
| 2023 | 327 | 19.0% |
| 2024 | 304 | 21.1% |
| 2025 | 271 | 18.4% |
What to check before buying a 1998 7 Series
The failure pattern for this year is specific enough to inspect against: suspension accounted for 10.6% of tests. Start there.
- Suspension (10.6% 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.
- Lighting & signalling (9.1% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (8.3% 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 1998 BMW 7 Seriess pass their MOT?
79.1% of the 1,686 1998 BMW 7 Series MOT tests in this dataset passed — a 20.9% fail rate.
What is the most common MOT failure on a 1998 BMW 7 Series?
Suspension, recorded in 10.6% of tests, followed by lighting & signalling (9.1%).
Does the 1998 7 Series get worse with mileage?
Its MOT fail rate rises from 26.9% in the 0-30k band to 20.9% in the 150k+ band.
Methodology & source. Based on 1,686 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.