1988 BMW 6 Series — MOT failures & pass rate
The 1988 BMW 6 Series passed 84.8% of its 494 recorded MOT tests. That is 1.8 percentage points better than coupes & convertibles of a similar age, which fail at 16.9%. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
No single area dominates — lighting & signalling (8.3%) and suspension (6.1%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are headlamp aim, component mounting prescribed areas and washers — headlamp aim alone was recorded 26 times.
Mileage matters less than usual here: the 1988 6 Series fails 15.6% of the time in the 30-60k band and 17.1% at 150k+, a spread of only 1.4 points.
Suspension is the most common advisory, noted on 18.4% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 19.1% in 2021 to 7.5% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 8.3% | 41 |
| 2 | Suspension | 6.1% | 30 |
| 3 | Brakes | 5.7% | 28 |
| 4 | Visibility | 5.1% | 25 |
| 5 | Body, structure & corrosion | 3.0% | 15 |
| 6 | Emissions & environmental | 2.2% | 11 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 26 |
| 2 | Component mounting prescribed areas | 21 |
| 3 | Washers | 20 |
| 4 | Headlamp | 20 |
| 5 | Service brake performance | 14 |
| 6 | Chassis condition | 13 |
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 | 18.4% | 91 |
| 2 | Brakes | 16.8% | 83 |
| 3 | Emissions & environmental | 13.4% | 66 |
| 4 | Body, structure & corrosion | 10.9% | 54 |
| 5 | Tyres | 9.7% | 48 |
| 6 | Steering | 7.3% | 36 |
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 | 32 | 15.6% |
| 60-90k | 80 | 7.5% |
| 90-120k | 128 | 18.8% |
| 120-150k | 120 | 13.3% |
| 150k+ | 129 | 17.1% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 110 | 19.1% |
| 2022 | 93 | 14.0% |
| 2023 | 106 | 19.8% |
| 2024 | 92 | 14.1% |
| 2025 | 93 | 7.5% |
What to check before buying a 1988 6 Series
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 8.3% of tests. Start there.
- Lighting & signalling (8.3% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (6.1% 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 (5.7% 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 1988 BMW 6 Seriess pass their MOT?
84.8% of the 494 1988 BMW 6 Series MOT tests in this dataset passed — a 15.2% fail rate.
What is the most common MOT failure on a 1988 BMW 6 Series?
Lighting & signalling, recorded in 8.3% of tests, followed by suspension (6.1%).
Does the 1988 6 Series get worse with mileage?
Its MOT fail rate rises from 15.6% in the 30-60k band to 17.1% in the 150k+ band.
Methodology & source. Based on 494 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.