BMW Z4 (2003)
Running costs, common problems, and reliability data based on 5,310 real MOT tests in 2024.
MOT Pass Rate
79%
Total Tests (2024)
5,310
Avg Mileage
98,016 mi
Est. Annual Cost
£2,397
Is the 2003 BMW Z4 reliable?
Average reliability. Expect some repairs as it ages. That's close to the national average of 82%. It falls below the BMW brand average of 88%.
At 21 years old, 79% of BMW Z4s from 2003 passed their MOT first time in 2024. That's based on 5,310 tests across the UK. The average mileage at this age is 98,016 miles.
How does the 2003 BMW Z4 compare?
Mileage Analysis
The average 2003 BMW Z4 has 98,016 miles on the clock, which is below the expected 155,400 miles for a 21-year-old car. This suggests lighter use than average, which generally means less wear on major components.
Best year to buy a BMW Z4?
The most reliable year is the 2022 model with a 97% MOT pass rate, while the 2005 model has the lowest at 78%. The 2003 sits between the two at 79%.
How much does a 2003 BMW Z4 cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
BMW Z4 by Year
| Year | Pass Rate | Tests | Avg Mileage |
|---|---|---|---|
| 2022 | 97% | 190 | 16,859 mi |
| 2021 | 95% | 3,193 | 18,645 mi |
| 2020 | 94% | 4,507 | 22,507 mi |
| 2019 | 93% | 5,476 | 26,551 mi |
| 2017 | 92% | 281 | 36,527 mi |
| 2016 | 88% | 2,559 | 41,764 mi |
| 2015 | 90% | 3,403 | 47,388 mi |
| 2014 | 89% | 3,837 | 52,736 mi |
| 2013 | 88% | 3,369 | 58,294 mi |
| 2012 | 87% | 4,094 | 65,038 mi |
| 2011 | 88% | 4,148 | 66,482 mi |
| 2010 | 87% | 3,917 | 72,537 mi |
| 2009 | 87% | 5,341 | 75,050 mi |
| 2008 | 81% | 3,803 | 80,859 mi |
| 2007 | 83% | 6,508 | 87,843 mi |
| 2006 | 81% | 6,617 | 89,752 mi |
| 2005 | 78% | 4,523 | 96,092 mi |
| 2004 | 81% | 6,308 | 95,043 mi |
| 2003 | 79% | 5,310 | 98,016 mi |
Checking a specific BMW Z4?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2003 BMW Z4
The 2003 BMW Z4 is a premium with a 2494cc petrol engine. 5,310 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. It ranks in the top 24% of all 2003 cars for reliability.
With an average of 98,016 miles at 21 years old, BMW Z4 owners tend to use this car less than the typical driver.
2003 BMW Z4 Fuel Costs
The 2494cc petrol engine offers a reasonable balance between performance and economy. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2003 BMW Z4?
Total estimated annual running cost is £2,397 (£200/month), broken down as £1592 fuel, £250 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 79% pass rate. Keeping on top of servicing will help avoid surprises.
BMW Z4 Reliability Trend
Newer BMW Z4s show better MOT pass rates than older ones, with an average improvement of 9 percentage points.
Buying a Used 2003 BMW Z4
At 21 years old, the BMW Z4 is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2022 model has the highest pass rate at 97%. With 5,310 MOT tests in our data, there's strong statistical confidence in these figures.
Alternatives to the 2003 BMW Z4
The BMW Z4 is actually the most reliable option among similar petrol premiums from this era. Here are comparable petrol cars with similar engines:
- RENAULT CLIO (2005) 67% pass rate (-12%) from 18,423 tests
- HONDA CR-V (2005) 70% pass rate (-9%) from 16,222 tests
- MERCEDES E (2005) 78% pass rate (-1%) from 8,269 tests
- FORD MONDEO (2004) 69% pass rate (-10%) from 7,419 tests