BMW 420I M Sport Auto
Reliability, estimated running costs, and MOT data across 3 model years from 8,054 MOT tests in 2024.
Avg Pass Rate
95%
Total Tests
8,054
Highest Pass Rate
2020 (95%)
Years Covered
3
About the BMW 420I M Sport Auto
The BMW 420I M Sport Auto was MOT tested 8,054 times in 2024 (DVSA data, retests included) across 3 model years (2020 to 2022), with an average pass rate of 95%. That's comfortably above the average of 82% across all models in our data. Our records list petrol versions.
Best and Worst Years
Of the years with at least 100 tests, the 2020 model has the highest pass rate at 95% from 612 tests. The 2021 model has the lowest at 93%. With just a 2 point gap, pass rates are similar across these years. Newer cars usually pass more often simply because they are younger.
Mileage Across Years
The oldest model in our data (2020) averages 28,653 miles, while the newest (2022) averages 20,536 miles.
Compared to the BMW brand average of 88%, the 420I M Sport Auto performs 7 points better, making it one of the more reliable options in the BMW range.
Estimated Running Costs
Based on 7,400 miles/year, average pump prices of 174.57p petrol and 199.33p diesel (GOV.UK weekly road fuel prices, week of 19 October 2026), and MOT pass rate data. Insurance not included.
Full 2022 detailsHow reliable is the BMW 420I M Sport Auto?
BMW 420I M Sport Auto by Year
Click any year to see detailed running costs, reliability data, and comparisons with similar cars.
Questions about the BMW 420I M Sport Auto
Is the BMW 420I M Sport Auto reliable?
Across its 3 model years in our data (2020 to 2022), the BMW 420I M Sport Auto averages a 95% MOT pass rate, from 8,054 tests (DVSA MOT data for tests in 2024, retests included). That's 13 points above the average of 82% across all models in the same data. The 2020 model has the highest pass rate of the years with at least 100 tests, at 95%.
Which year BMW 420I M Sport Auto has the best MOT pass rate?
Of the years with at least 100 tests, the 2020 BMW 420I M Sport Auto has the highest MOT pass rate at 95%, while the 2021 model has the lowest at 93%, a 2 point gap. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.
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