1991 BMW 8 Series — MOT failures & pass rate
The 1991 BMW 8 Series passed 84.2% of its 328 recorded MOT tests. Coupes & convertibles of a similar age fail 18.8% of the time, so this is 2.9pp better than the group it competes with. Failures cluster in lighting & signalling, visibility and brakes.
What the MOT record shows
No single area dominates — lighting & signalling (10.7%) and visibility (8.5%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are washers, wipers and headlamp aim — washers alone was recorded 21 times.
Mileage is the strongest signal on the record: 12.8% of 30-60k cars fail, rising to 20.0% once past 150k.
Brakes is the most common advisory, noted on 24.4% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 20.8% in 2021 to 13.1% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 10.7% | 35 |
| 2 | Visibility | 8.5% | 28 |
| 3 | Brakes | 8.2% | 27 |
| 4 | Suspension | 5.8% | 19 |
| 5 | Body, structure & corrosion | 3.4% | 11 |
| 6 | Tyres | 1.8% | 6 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Washers | 21 |
| 2 | Wipers | 17 |
| 3 | Headlamp aim | 14 |
| 4 | Service brake performance | 14 |
| 5 | Ball joint dust cover | 9 |
| 6 | Headlamp | 8 |
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 | 24.4% | 80 |
| 2 | Suspension | 20.7% | 68 |
| 3 | Emissions & environmental | 16.5% | 54 |
| 4 | Tyres | 10.7% | 35 |
| 5 | Other defects | 9.2% | 30 |
| 6 | Body, structure & corrosion | 7.0% | 23 |
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 | 39 | 12.8% |
| 60-90k | 90 | 13.3% |
| 90-120k | 51 | 21.6% |
| 120-150k | 82 | 15.8% |
| 150k+ | 45 | 20.0% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 77 | 20.8% |
| 2022 | 73 | 17.8% |
| 2023 | 56 | 8.9% |
| 2024 | 61 | 16.4% |
| 2025 | 61 | 13.1% |
What to check before buying a 1991 8 Series
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 10.7% of tests. Start there.
- Lighting & signalling (10.7% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (8.5% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£150.
- Brakes (8.2% 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 1991 BMW 8 Seriess pass their MOT?
84.2% of the 328 1991 BMW 8 Series MOT tests in this dataset passed — a 15.8% fail rate.
What is the most common MOT failure on a 1991 BMW 8 Series?
Lighting & signalling, recorded in 10.7% of tests, followed by visibility (8.5%).
Does the 1991 8 Series get worse with mileage?
Its MOT fail rate rises from 12.8% in the 30-60k band to 20.0% in the 150k+ band.
Methodology & source. Based on 328 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.