2003 Bmw Z4 — MOT failures & pass rate
Across 16,484 MOT tests analysed for the 2003 Bmw Z4, the most common recorded failure areas were brakes, suspension and lighting & signalling. Its pass rate of 77.4% was in line with the average for coupes & convertibles of a similar age (76.8%). Higher-mileage examples failed more often — 28.9% in the 150k+ group versus 11.4% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Brakes | 9.1% | 1,503 |
| 2 | Suspension | 9.0% | 1,492 |
| 3 | Lighting & signalling | 8.5% | 1,407 |
| 4 | Visibility | 5.3% | 865 |
| 5 | Tyres | 4.7% | 768 |
| 6 | Seat belts & restraints | 4.5% | 734 |
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 | 930 |
| 2 | Headlamp aim | 877 |
| 3 | SRS malfunction indicator lamp | 707 |
| 4 | Tread depth | 605 |
| 5 | Ball joint | 544 |
| 6 | Wipers | 539 |
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 | 36.9% | 6,087 |
| 2 | Suspension | 29.1% | 4,795 |
| 3 | Tyres | 21.5% | 3,550 |
| 4 | Emissions & environmental | 13.4% | 2,200 |
| 5 | Lighting & signalling | 11.9% | 1,958 |
| 6 | Other defects | 7.0% | 1,162 |
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 | 308 | 11.4% |
| 30-60k | 1,972 | 14.8% |
| 60-90k | 4,668 | 20.3% |
| 90-120k | 5,834 | 24.8% |
| 120-150k | 2,798 | 26.2% |
| 150k+ | 867 | 28.9% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 3,709 | 24.0% |
| 2022 | 3,483 | 21.4% |
| 2023 | 3,379 | 23.9% |
| 2024 | 3,061 | 22.4% |
| 2025 | 2,852 | 20.8% |
What to check before buying a 2003 Z4
Before buying a 2003 Bmw Z4, focus on the areas it most often fails on. Brakes accounted for 9.1% of tests for this year.
- Brakes (9.1% 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.
- Suspension (9.0% 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.
- Lighting & signalling (8.5% 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 2003 Bmw Z4s pass their MOT?
77.4% of the 16,484 2003 Bmw Z4 MOT tests in this dataset passed — a 22.6% fail rate.
What is the most common MOT failure on a 2003 Bmw Z4?
Brakes, recorded in 9.1% of tests, followed by suspension (9.0%).
Does the 2003 Z4 get worse with mileage?
Its MOT fail rate rises from 11.4% in the 0-30k band to 28.9% in the 150k+ band.
Methodology & source. Based on 16,484 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.