Sports car and convertible · 1996–2021 cars
BMW Z3 reliability
The BMW Z3 fails 31.3% of first MOT tests, 15% fewer MOT fails than the average car its age and mileage, based on 43,023 DVSA MOT tests from 2022 to 2024.
Checking a BMW Z3 before you buy?
- first-time MOT fail rate (all cars: 28.4%)
- 31.3%
- first-time MOT fail rate (all cars: 28.4%)
- fails than cars of the same age and mileage
- 15% fewer
- fails than cars of the same age and mileage
- MOT tests analysed, 2022 to 2024
- 43,023
- MOT tests analysed, 2022 to 2024
- typical miles a year, from MOT readings
- –
- typical miles a year, from MOT readings
MOT fail rate by age
How the BMW Z3 ages
Each point is the share of BMW Z3s of that age that failed their MOT first time, against all cars of the same age.
| Age at MOT (years) | BMW Z3 | All cars |
|---|---|---|
| 19 | 30.1% | 43.4% |
| 20 | 29.1% | 42.8% |
| 21 | 29.5% | 41.4% |
| 22 | 31% | 40.6% |
| 23 | 31.6% | 38.9% |
| 24 | 32.2% | 37.1% |
| 25 | 32.1% | 35.8% |
By year
The best and worst BMW Z3 years
2002 cars come out best and 1997 cars worst, once age and mileage are taken into account.
| First registered | Tests | Fail rate | Against same-age cars | Typical mileage |
|---|---|---|---|---|
| 2003 | 286 | 25.9% | 30% fewer fails | 63,108 |
| 2002 Z3 | 4,052 | 27.5% | 29% fewer fails | 76,012 |
| 2001 Z3 | 6,370 | 31.2% | 19% fewer fails | 79,449 |
| 2000 Z3 | 6,596 | 30.6% | 19% fewer fails | 81,377 |
| 1999 Z3 | 12,262 | 31% | 15% fewer fails | 86,739 |
| 1998 Z3 | 10,273 | 32.4% | 8% fewer fails | 85,788 |
| 1997 Z3 | 3,040 | 37.4% | 6% more fails | 91,024 |
Common problems
What fails most on a BMW Z3
Its weak spot is seat belts and airbags: 25% more fails there than cars of the same age and mileage.
Fail rate by area
- Lights and electrics11.3%30% below avg
- Brakes11.2%3% below avg
- Suspension10.2%19% below avg
- Exhaust, emissions and leaks7.3%7% above avg
- Windscreen, wipers and mirrors6.4%7% below avg
- Seat belts and airbags3.8%25% above avg
- Body, chassis and structure3.6%58% below avg
- Tyres3.3%27% below avg
- Steering1.1%63% below avg
Average for cars of the same age and mileage
Top MOT failures
- 1
Airbag warning lamp shows fault 2.68% of tests
A lit airbag warning means the airbag system may not deploy in a crash, so it needs diagnosing and repairing.
- 2
Position lamp not working 2.62% of tests
A failed position lamp makes the car harder to see in poor light and is illegal, so it must be repaired.
- 3
Rigid brake pipe excessively corroded 2.18% of tests
Badly corroded brake pipes can leak or fail, which can cause a loss of braking, so repair is urgent.
- 4
Coil spring fractured or broken 2.13% of tests
A broken coil spring can leave the car sitting low or unstable, so it must be replaced before driving.
- 5
Suspension ball joint excessively worn 2.09% of tests
A worn ball joint can fail and cause loss of steering control, so it must be replaced promptly.
- 6
Windscreen washer fluid insufficient 2.03% of tests
Washers are not supplying enough liquid, so the windscreen cannot be cleared properly, which is a safety issue.
- 7
Lambda reading outside specified limits 2% of tests
An out-of-range lambda reading suggests poor fuel mixture or a failing catalytic converter, so diagnosis is needed.
- 8
ABS warning lamp shows a fault 1.89% of tests
A lit ABS warning means the anti-lock system may not work, so wheels could lock during emergency braking.
Most common advisories
Not a fail yet, but worth pricing in: these show up on a BMW Z3's MOT certificate most often.
- Brake pipes corroded and greasy16.02%
- Engine oil leak, not excessive8.44%
- Brake disc pitted or scored7.47%
- Tyre worn close to legal limit7.39%
- Tyre slightly damaged or cracking6.86%
- Suspension arm pin/bush showing wear5.06%
Before you buy
What to check on a used BMW Z3
- 1
Airbag warning lamp shows fault
A lit airbag warning means the airbag system may not deploy in a crash, so it needs diagnosing and repairing.
- 2
Position lamp not working
A failed position lamp makes the car harder to see in poor light and is illegal, so it must be repaired.
- 3
Rigid brake pipe excessively corroded
Badly corroded brake pipes can leak or fail, which can cause a loss of braking, so repair is urgent.
- 4
Coil spring fractured or broken
A broken coil spring can leave the car sitting low or unstable, so it must be replaced before driving.
- 5
Every MOT since new
Look for the faults above coming back year after year: it shows how the car has been looked after.
- 6
The mileage record
A drop between MOTs is a warning sign.
- 7
Finance, stolen and write-off
The records the MOT can't show. A Full Check (£9.99) covers all three before you hand over any money.
Fuel types tested
- Petrol99.9%
- Diesel0%
- Electric0%
- LPG0%
- Other0%
Most common colours
Blue, Silver, Black, Green, Red
Average engine size: 2.3 litres.
Compare
How the BMW Z3 compares with its rivals
| Model | Fail rate | Against same-age cars |
|---|---|---|
| Jaguar XKR | 22.6% | 37% fewer MOT fails than the average car its age |
| Mercedes-Benz SLC | 11.8% | 18% fewer MOT fails than the average car its age |
| Ford Mustang | 14.7% | 15% fewer MOT fails than the average car its age |
| BMW Z3 | 31.3% | 15% fewer MOT fails than the average car its age |
| Volkswagen Eos | 33.7% | 14% fewer MOT fails than the average car its age |
| MG TF | 30.8% | 13% fewer MOT fails than the average car its age |
| Peugeot RCZ | 33% | 10% more MOT fails than the average car its age |
Every sports car and convertible ranked in the sports car and convertible reliability index, or all BMW models.
Questions
BMW Z3 questions, answered
Is the BMW Z3 reliable?
On MOT results, the BMW Z3 is about average: it fails 31.3% of first MOT tests, 15% fewer MOT fails than the average car its age and mileage. It ranks 50 of 62 sports car and convertible models in our index.
What fails most on a BMW Z3 MOT?
The most common MOT failures on the BMW Z3 are airbag warning lamp shows fault (2.68% of tests), position lamp not working (2.62% of tests), rigid brake pipe excessively corroded (2.18% of tests). By area, lights and electrics fails 11.3% of its tests.
Which BMW Z3 year is the most reliable?
Among years with 1,000+ tests, 2002 cars do best (29% fewer MOT fails than the average car its age) and 1997 cars do worst (6% more MOT fails than the average car its age).
How do I check a BMW Z3 before I buy it?
Enter its registration for a free check of its MOT history, mileage, ULEZ status and tax. Before you pay, a Full Check (£9.99) shows outstanding finance, stolen and write-off records.
Source: DVSA anonymised MOT test results, 2022 to 2024, class 4 vehicles aged 3 to 25, normal tests only. How we compare like with like: our methodology.
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