BMW 420D M SPORT MHEV AUTO (2021)
Running costs, common problems, and reliability data based on 2,262 real MOT tests in 2024.
MOT Pass Rate
90%
Total Tests (2024)
2,262
Avg Mileage
28,824 mi
Est. Annual Cost
£1,772
Is the 2021 BMW 420D M SPORT MHEV AUTO reliable?
Excellent reliability. Very few MOT failures. That's 8 points above the national average of 82%.
At 3 years old, 90% of BMW 420D M SPORT MHEV AUTOs from 2021 passed their MOT first time in 2024. That's based on 2,262 tests across the UK. The average mileage at this age is 28,824 miles.
How does the 2021 BMW 420D M SPORT MHEV AUTO compare?
Mileage Analysis
The average 2021 BMW 420D M SPORT MHEV AUTO has 28,824 miles on the clock, which is above the expected 22,200 miles for a 3-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
Best year to buy a BMW 420D M SPORT MHEV AUTO?
The most reliable year is the 2020 model with a 98% MOT pass rate, while the 2021 model has the lowest at 90%. Consider a different year if reliability is a priority.
How much does a 2021 BMW 420D M SPORT MHEV 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 420D M SPORT MHEV AUTO by Year
Checking a specific BMW 420D M SPORT MHEV AUTO?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2021 BMW 420D M SPORT MHEV AUTO
The 2021 BMW 420D M SPORT MHEV AUTO is a premium with a 1995cc petrol engine. 2,262 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 28,824 miles at 3 years old, BMW 420D M SPORT MHEV AUTO owners cover more miles than the average driver.
2021 BMW 420D M SPORT MHEV AUTO Fuel Costs
The 1995cc 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 420D M SPORT MHEV AUTO?
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 90% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
BMW 420D M SPORT MHEV AUTO Reliability Trend
Older BMW 420D M SPORT MHEV AUTOs tend to have better MOT pass rates than newer ones, with an average decline of 5 percentage points across model years.
Buying a Used 2021 BMW 420D M SPORT MHEV 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.
Alternatives to the 2021 BMW 420D M SPORT MHEV 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:
- LAND ROVER DISCOVERY SPORT R-DYN SE D A (2020) 90% pass rate (same) from 5,505 tests
- BMW 520D M SPORT MHEV AUTO (2021) 89% pass rate (-1%) from 3,423 tests
- BMW 320D M SPORT MHEV AUTO (2021) 91% pass rate (+1%) from 3,336 tests
- VOLVO XC90 R-DESIGN B5 MHEV AWD AUTO (2021) 90% pass rate (same) from 2,911 tests