BMW 420I XDRIVE M SPORT AUTO (2021)
Running costs, reliability data, and common problems from 67 real MOT tests.
Annual Cost
£1,927
£161/month
MOT Pass Rate
87%
Good
Road Tax
£195
Flat rate/year
Insurance
Grp 18-32
1998cc Petrol
Solid Option
87% pass rate, £1927/year to run. 5 points above average.
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Annual Running Costs
~36 mpg
Flat rate (post-2017)
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
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Reliability Verdict
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%.
At 5 years old, 87% of BMW 420I XDRIVE M SPORT AUTOs from 2021 passed their MOT first time in 2026. That's based on 67 tests across the UK. The average mileage at this age is 29,821 miles.
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How Does It Compare?
Mileage Analysis
29,821
Average miles
37,000
Expected for age
The average 2021 BMW 420I XDRIVE M SPORT AUTO has 29,821 miles on the clock, which is in line with the expected 37,000 miles for a 5-year-old car, suggesting normal everyday use.
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About the 2021 BMW 420I XDRIVE M SPORT AUTO
The 2021 BMW 420I XDRIVE M SPORT AUTO is a premium with a 1998cc petrol engine. 67 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 89% of 2021 cars for MOT pass rates.
With an average of 29,821 miles at 5 years old, BMW 420I XDRIVE M SPORT AUTO owners drive about as much as the UK average.
2021 BMW 420I XDRIVE M SPORT AUTO 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 420I XDRIVE M SPORT AUTO?
Total estimated annual running cost is £1,927 (£161/month), broken down as £1327 fuel, £195 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 87% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2021 BMW 420I XDRIVE M SPORT AUTO
At 5 years old, the BMW 420I XDRIVE M SPORT AUTO offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. Note: with only 67 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2021 BMW 420I XDRIVE M SPORT AUTO's fuel type, age, and engine size, these are the most likely problem areas to check.
Service History
Low riskAlways request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.
Running Costs Compared
How the 2021 BMW 420I XDRIVE M SPORT AUTO stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| BMW 420I XDRIVE M SPORT AUTO(2021) | 87% | £1327 | £195 | Grp 18-32 | £1927 |
| VOLKSWAGEN GOLF(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| NISSAN QASHQAI(2020) | 93% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| MINI COOPER(2019) | 92% | £1137 | £190 | Grp 12-25 | £1582-£345 |
| HYUNDAI TUCSON(2019) | 90% | £1137 | £190 | Grp 12-25 | £1582-£345 |
Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.
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