What year BMW 420 is most reliable?

Based on MOT first-test pass rates, the 2021 BMW 420 has the highest pass rate at 92.5%, out of 327 vehicles tested.

What are the most common BMW 420 MOT failures?

The most common BMW 420 MOT failures vary by year. Check the individual year pages for detailed defect breakdowns — links in the table above.

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BMW 420 — Reliability by Year

66,368 vehicles · MOT data 2013–2021 · first-test pass rates

This page shows MOT first-test pass rates for each year the BMW 420 was manufactured — click any year to explore that cohort in detail. Trying to decide which year to buy? See the full buying guide →

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Best pass rate year

2021

92.5% pass rate · 327 vehicles

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Lowest pass rate year

2013

85.1% pass rate · 647 vehicles

Year	Pass rate	Avg mileage	Vehicles
2021	92.5%	29,940 mi	327
2020	91.3%	30,362 mi	3,058
2019	89.7%	35,548 mi	7,639
2018	89.8%	40,050 mi	10,491
2017	89.8%	48,220 mi	12,164
2016	88.5%	55,646 mi	12,174
2015	87.2%	59,544 mi	11,207
2014	85.7%	62,285 mi	8,661
2013	85.1%	66,983 mi	647

Which year BMW 420 is most reliable?

MOT pass rate by year of manufacture — averaged across each vehicle's lifetime of tests.

Tests range from an average of 29,940 miles (newest year) to 66,983 miles (oldest year). Older years naturally accumulate more tests at higher mileages — see the mileage-normalised breakdown →

Trying to decide which year to buy?

We've done the full analysis — which years to look for, which to avoid, and where to find the best value for reliability on a BMW 420.

See the buying guide →

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