1991 BMW 3 Series — MOT failures & pass rate
Across 4,536 MOT tests, the 1991 BMW 3 Series recorded an 83.3% pass rate. Executive cars of a similar age fail 19.1% of the time, so this is 2.4pp better than the group it competes with. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
Lighting & signalling dominates the failure mix at 11.7% of all tests — 4.9 points clear of suspension, so it is the first thing to check.
At component level the recurring items are headlamp aim, washers and component mounting prescribed areas — headlamp aim alone was recorded 322 times.
Condition tracks the odometer closely. Failures run at 9.5% in the 0-30k band and 17.9% in the 150k+ band, a 8.4-point spread.
Advisories point at the next bill rather than this one: brakes was flagged on 22.2% of tests without failing them.
The trend is improving — the fail rate fell from 19.0% in 2021 to 14.2% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 11.7% | 529 |
| 2 | Suspension | 6.8% | 306 |
| 3 | Brakes | 6.0% | 271 |
| 4 | Visibility | 6.0% | 271 |
| 5 | Body, structure & corrosion | 3.7% | 168 |
| 6 | Steering | 2.1% | 94 |
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 | 322 |
| 2 | Washers | 203 |
| 3 | Component mounting prescribed areas | 175 |
| 4 | Position lamp | 131 |
| 5 | Wipers | 122 |
| 6 | Individual direction indicators | 113 |
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 | 22.2% | 1,007 |
| 2 | Suspension | 21.9% | 994 |
| 3 | Emissions & environmental | 13.7% | 621 |
| 4 | Tyres | 13.2% | 600 |
| 5 | Other defects | 11.7% | 530 |
| 6 | Body, structure & corrosion | 11.2% | 509 |
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 | 95 | 9.5% |
| 30-60k | 272 | 14.0% |
| 60-90k | 869 | 14.1% |
| 90-120k | 1,291 | 17.0% |
| 120-150k | 1,171 | 18.5% |
| 150k+ | 826 | 17.9% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 1,023 | 19.0% |
| 2022 | 979 | 17.3% |
| 2023 | 900 | 16.0% |
| 2024 | 837 | 16.5% |
| 2025 | 797 | 14.2% |
What to check before buying a 1991 3 Series
On a 1991 3 Series, lighting & signalling is what the MOT record says goes wrong most — it appeared in 11.7% of tests. Check these areas before you commit.
- Lighting & signalling (11.7% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (6.8% 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 (6.0% 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 3 Seriess pass their MOT?
83.3% of the 4,536 1991 BMW 3 Series MOT tests in this dataset passed — a 16.7% fail rate.
What is the most common MOT failure on a 1991 BMW 3 Series?
Lighting & signalling, recorded in 11.7% of tests, followed by suspension (6.8%).
Does the 1991 3 Series get worse with mileage?
Its MOT fail rate rises from 9.5% in the 0-30k band to 17.9% in the 150k+ band.
Methodology & source. Based on 4,536 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.