Bmw 420
Reliability, running costs, and MOT data across 9 years from 141,320 real MOT tests.
Avg Pass Rate
89%
Total Tests
141,320
Best Year
2021 (94%)
Years Covered
9
How reliable is the Bmw 420?
Bmw 420 by Year
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About the Bmw 420
The Bmw 420 has been tested 141,320 times in 2024 MOT data across 9 model years (2013 to 2021), with an average pass rate of 89%. That's comfortably above the national average of 82%, making it a reliable choice. Available as diesel and petrol.
Best and Worst Years
The 2021 model is the most reliable with a 94% pass rate from 730 tests. The 2013 model has the lowest at 85%. The 9 point spread between years means reliability varies somewhat, but no year is dramatically different.
Reliability Trend
Newer BMW 420s show better MOT pass rates than older ones, with an average improvement of 4 percentage points.
Mileage Across Years
The oldest model in our data (2013) averages 99,720 miles, while the newest (2021) averages 28,172 miles.
Click any year in the table above to see detailed running costs, individual reliability data, and comparisons with similar cars.