2006 BMW Z4 — MOT failures & pass rate
The 2006 BMW Z4 passed 79.1% of its 19,331 recorded MOT tests. That is 1.1 percentage points better than coupes & convertibles of a similar age, which fail at 22.0%. Failures cluster in suspension, brakes and lighting & signalling.
What the MOT record shows
No single area dominates — suspension (9.2%) and brakes (8.3%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are rigid brake pipes, headlamp aim and pins and bushes — rigid brake pipes alone was recorded 1,267 times.
A 150k+ example is materially riskier than a 0-30k one: 29.3% versus 11.2%.
Brakes is the most common advisory, noted on 35.9% of tests — work that passed today but is likely due soon.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 9.2% | 1,768 |
| 2 | Brakes | 8.3% | 1,604 |
| 3 | Lighting & signalling | 7.9% | 1,530 |
| 4 | Visibility | 4.5% | 860 |
| 5 | Emissions & environmental | 4.2% | 811 |
| 6 | Tyres | 4.0% | 780 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Rigid brake pipes | 1,267 |
| 2 | Headlamp aim | 734 |
| 3 | Pins and bushes | 592 |
| 4 | Wipers | 529 |
| 5 | Malfunction indicator lamp | 511 |
| 6 | Headlamp | 510 |
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 | 35.9% | 6,947 |
| 2 | Suspension | 22.5% | 4,357 |
| 3 | Tyres | 20.5% | 3,967 |
| 4 | Emissions & environmental | 12.5% | 2,421 |
| 5 | Lighting & signalling | 10.7% | 2,063 |
| 6 | Body, structure & corrosion | 4.7% | 917 |
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 | 601 | 11.2% |
| 30-60k | 3,286 | 12.9% |
| 60-90k | 6,715 | 20.1% |
| 90-120k | 5,868 | 24.1% |
| 120-150k | 2,218 | 26.3% |
| 150k+ | 635 | 29.3% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 4,144 | 21.1% |
| 2022 | 4,101 | 21.4% |
| 2023 | 3,931 | 20.3% |
| 2024 | 3,713 | 21.3% |
| 2025 | 3,442 | 20.1% |
What to check before buying a 2006 Z4
The failure pattern for this year is specific enough to inspect against: suspension accounted for 9.2% of tests. Start there.
- Suspension (9.2% 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 (8.3% 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 (7.9% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
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 2006 BMW Z4s pass their MOT?
79.1% of the 19,331 2006 BMW Z4 MOT tests in this dataset passed — a 20.8% fail rate.
What is the most common MOT failure on a 2006 BMW Z4?
Suspension, recorded in 9.2% of tests, followed by brakes (8.3%).
Does the 2006 Z4 get worse with mileage?
Its MOT fail rate rises from 11.2% in the 0-30k band to 29.3% in the 150k+ band.
Methodology & source. Based on 19,331 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.