1999 BMW Z3 — MOT failures & pass rate
Across 17,734 MOT tests, the 1999 BMW Z3 recorded a 77.2% pass rate. Coupes & convertibles of a similar age fail at 22.0%, so the 1999 Z3 sits squarely on the average. Failures cluster in brakes, lighting & signalling and suspension.
What the MOT record shows
No single area dominates — brakes (9.8%) and lighting & signalling (9.3%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are catalyst emissions, rigid brake pipes and headlamp aim — catalyst emissions alone was recorded 1,218 times.
Condition tracks the odometer closely. Failures run at 11.3% in the 0-30k band and 32.8% in the 150k+ band, a 21.5-point spread — more than double.
Advisories point at the next bill rather than this one: brakes was flagged on 35.6% of tests without failing them.
The trend is improving — the fail rate fell from 24.7% in 2021 to 21.6% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Brakes | 9.8% | 1,745 |
| 2 | Lighting & signalling | 9.3% | 1,642 |
| 3 | Suspension | 8.9% | 1,580 |
| 4 | Emissions & environmental | 5.8% | 1,025 |
| 5 | Visibility | 5.3% | 945 |
| 6 | Seat belts & restraints | 3.9% | 689 |
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 | 1,218 |
| 2 | Rigid brake pipes | 774 |
| 3 | Headlamp aim | 682 |
| 4 | Position lamp | 644 |
| 5 | Washers | 632 |
| 6 | SRS malfunction indicator lamp | 594 |
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 | 35.6% | 6,311 |
| 2 | Suspension | 29.7% | 5,269 |
| 3 | Tyres | 18.9% | 3,354 |
| 4 | Emissions & environmental | 11.7% | 2,066 |
| 5 | Body, structure & corrosion | 11.3% | 1,999 |
| 6 | Lighting & signalling | 9.1% | 1,612 |
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 | 735 | 11.3% |
| 30-60k | 3,087 | 15.0% |
| 60-90k | 5,501 | 21.8% |
| 90-120k | 5,133 | 26.0% |
| 120-150k | 2,366 | 28.0% |
| 150k+ | 841 | 32.8% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 3,998 | 24.7% |
| 2022 | 3,773 | 23.3% |
| 2023 | 3,586 | 22.1% |
| 2024 | 3,230 | 21.9% |
| 2025 | 3,147 | 21.6% |
What to check before buying a 1999 Z3
On a 1999 Z3, brakes is what the MOT record says goes wrong most — it appeared in 9.8% of tests. Check these areas before you commit.
- Brakes (9.8% 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.
- Lighting & signalling (9.3% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (8.9% 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.
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 1999 BMW Z3s pass their MOT?
77.2% of the 17,734 1999 BMW Z3 MOT tests in this dataset passed — a 22.8% fail rate.
What is the most common MOT failure on a 1999 BMW Z3?
Brakes, recorded in 9.8% of tests, followed by lighting & signalling (9.3%).
Does the 1999 Z3 get worse with mileage?
Its MOT fail rate rises from 11.3% in the 0-30k band to 32.8% in the 150k+ band.
Methodology & source. Based on 17,734 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.