1985 BMW 5 Series — MOT failures & pass rate
487 MOT tests on the 1985 BMW 5 Series are in this dataset, and 82.5% of them passed. That is effectively the same as executive cars of a similar age (17.4% fail rate), so the MOT record here is unremarkable in either direction. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
One area stands out: lighting & signalling, recorded in 12.9% of tests against 7.4% for the next-worst category.
At component level the recurring items are stop lamp, headlamp aim and position lamp — stop lamp alone was recorded 29 times.
Mileage is the strongest signal on the record: 6.1% of 30-60k cars fail, rising to 17.9% once past 150k — 2.9× the risk.
Suspension is the most common advisory, noted on 20.1% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 17.8% in 2021 to 14.1% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 12.9% | 63 |
| 2 | Suspension | 7.4% | 36 |
| 3 | Brakes | 5.9% | 29 |
| 4 | Body, structure & corrosion | 4.7% | 23 |
| 5 | Visibility | 4.7% | 23 |
| 6 | Emissions & environmental | 3.5% | 17 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Stop lamp | 29 |
| 2 | Headlamp aim | 26 |
| 3 | Position lamp | 18 |
| 4 | Component mounting prescribed areas | 18 |
| 5 | Washers | 17 |
| 6 | Service brake performance | 14 |
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 | 20.1% | 98 |
| 2 | Brakes | 16.6% | 81 |
| 3 | Emissions & environmental | 12.9% | 63 |
| 4 | Body, structure & corrosion | 12.3% | 60 |
| 5 | Tyres | 8.2% | 40 |
| 6 | Other defects | 6.4% | 31 |
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 | 33 | 6.1% |
| 60-90k | 76 | 14.5% |
| 90-120k | 132 | 18.9% |
| 120-150k | 124 | 21.0% |
| 150k+ | 112 | 17.9% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 107 | 17.8% |
| 2022 | 109 | 20.2% |
| 2023 | 105 | 18.1% |
| 2024 | 88 | 15.9% |
| 2025 | 78 | 14.1% |
What to check before buying a 1985 5 Series
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 12.9% of tests. Start there.
- Lighting & signalling (12.9% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (7.4% 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.
- Brakes (5.9% 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 1985 BMW 5 Seriess pass their MOT?
82.5% of the 487 1985 BMW 5 Series MOT tests in this dataset passed — a 17.4% fail rate.
What is the most common MOT failure on a 1985 BMW 5 Series?
Lighting & signalling, recorded in 12.9% of tests, followed by suspension (7.4%).
Does the 1985 5 Series get worse with mileage?
Its MOT fail rate rises from 6.1% in the 30-60k band to 17.9% in the 150k+ band.
Methodology & source. Based on 487 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.