BMW Z4 (2021)
Running costs, common problems, and reliability data based on 3,193 real MOT tests in 2024.
MOT Pass Rate
95%
Total Tests (2024)
3,193
Avg Mileage
18,645 mi
Est. Annual Cost
£1,772
Is the 2021 BMW Z4 reliable?
Excellent reliability. Very few MOT failures. That's 13 points above the national average of 82%. It also outperforms the BMW brand average of 88%.
At 3 years old, 95% of BMW Z4s from 2021 passed their MOT first time in 2024. That's based on 3,193 tests across the UK. The average mileage at this age is 18,645 miles.
How does the 2021 BMW Z4 compare?
Mileage Analysis
The average 2021 BMW Z4 has 18,645 miles on the clock, which is in line with the expected 22,200 miles for a 3-year-old car, suggesting normal everyday use.
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 2021 sits between the two at 95%.
How much does a 2021 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 2021 BMW Z4
The 2021 BMW Z4 is a premium with a 1998cc petrol engine. 3,193 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. It ranks in the top 22% of all 2021 cars for reliability.
With an average of 18,645 miles at 3 years old, BMW Z4 owners drive about as much as the UK average.
2021 BMW Z4 Fuel Costs
The 1998cc petrol engine offers a reasonable balance between performance and economy. Expect around 36 mpg in mixed driving, which works out to roughly £1,327 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2021 BMW Z4?
Total estimated annual running cost is £1,772 (£148/month), broken down as £1327 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 95% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
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 2021 BMW Z4
At 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet. If you're flexible on year, the 2022 model has the highest pass rate at 97%.
Alternatives to the 2021 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:
- VOLKSWAGEN GOLF (2019) 92% pass rate (-3%) from 89,653 tests
- NISSAN QASHQAI (2020) 93% pass rate (-2%) from 52,321 tests
- MINI COOPER (2019) 92% pass rate (-3%) from 52,140 tests
- HYUNDAI TUCSON (2019) 90% pass rate (-5%) from 42,920 tests