BMW 840I M SPORT AUTO (2021)
Running costs, common problems, and reliability data based on 3,657 real MOT tests in 2024.
MOT Pass Rate
92%
Total Tests (2024)
3,657
Avg Mileage
26,460 mi
Est. Annual Cost
£2,037
Is the 2021 BMW 840I M SPORT AUTO reliable?
Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%. It also outperforms the BMW brand average of 88%.
At 3 years old, 92% of BMW 840I M SPORT AUTOs from 2021 passed their MOT first time in 2024. That's based on 3,657 tests across the UK. The average mileage at this age is 26,460 miles.
How does the 2021 BMW 840I M SPORT AUTO compare?
Mileage Analysis
The average 2021 BMW 840I M SPORT AUTO has 26,460 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 840I M SPORT AUTO?
The most reliable year is the 2020 model with a 95% MOT pass rate, while the 2022 model has the lowest at 91%. The 2021 sits between the two at 92%.
How much does a 2021 BMW 840I M SPORT AUTO 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 840I M SPORT AUTO by Year
Checking a specific BMW 840I M SPORT AUTO?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 BMW 840I M SPORT AUTO
The 2021 BMW 840I M SPORT AUTO is a premium performance with a 2998cc petrol engine. 3,657 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. Among all cars from 2021, the average MOT pass rate is 92%, and this model falls short of that benchmark.
With an average of 26,460 miles at 3 years old, BMW 840I M SPORT AUTO owners drive about as much as the UK average.
2021 BMW 840I M SPORT AUTO Fuel Costs
The 2998cc petrol engine is on the larger side, so fuel won't be this car's strong point. 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 2021 BMW 840I M SPORT AUTO?
Total estimated annual running cost is £2,037 (£170/month), broken down as £1592 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
BMW 840I M SPORT AUTO Reliability Trend
Older BMW 840I M SPORT AUTOs tend to have better MOT pass rates than newer ones, with an average decline of 4 percentage points across model years.
Buying a Used 2021 BMW 840I M SPORT AUTO
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 2020 model has the highest pass rate at 95%.
Alternatives to the 2021 BMW 840I M SPORT AUTO
If reliability is your priority, there's one similar car with a higher MOT pass rate. Here are comparable petrol cars with similar engines:
- BMW 5 SERIES (2019) 92% pass rate (same) from 33,766 tests
- BMW X3 (2019) 92% pass rate (same) from 32,937 tests
- MERCEDES GLC (2019) 93% pass rate (+1%) from 30,341 tests
- BMW X5 (2019) 92% pass rate (same) from 23,506 tests