BMW 420I M Sport Auto MOT pass rate: 90.4% (6,183 tests, 2025)

The BMW 420I M Sport Auto passed 90.4% of its 6,183 MOT tests in 2025 — 12.9 points above the UK average of 77.5%. The median tested example was 3 years old with 25,803 miles on the clock.

90.4%Pass rate (2025)

6,183MOT tests analysed

25,803 miMedian mileage at test

3 yrsMedian age at test

How the 420I M Sport Auto compares

BMW 420I M Sport Auto

90.4%

UK average (all Class 4 vehicles)

77.5% across 33.1 million tests

BMW average (all models)

83.0%

What fails most on the BMW 420I M Sport Auto

Across failed and rectified tests in 2025, these vehicle systems produced the most defects on the 420I M Sport Auto:

#	System	Defects recorded	Share
1	Tyres	606	91.7%
2	Visibility	55	8.3%

Pre-MOT checklist for 420I M Sport Auto owners

Based on the failure profile above, ten minutes with a torch before your test removes the most likely fail items:

Check tread with the 20p test and inspect sidewalls for cracking — tyres close to the limit are the country’s most common advisory
Replace smeared wiper blades and top up washer fluid — both are test items

Check the engine before the tester does

A stored fault code with the engine light on is an automatic Major defect. Scan and clear resolved faults before booking.

Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
Autel UK testersAutel professional-grade diagnostic testers

420I M Sport Auto pass rate by registration year

Registration year	Tests	Pass rate	Vs same-age	Median mileage
2021	5,390	89.9%	-0.5 pts	25,528
2022	3,020	90.1%	-1.1 pts	22,844

Check a specific 420I M Sport Auto before you buy

Pass rates describe the model; they can’t tell you about the one car you’re looking at. Run its plate through our free MOT history check to see its personal record of failures, advisories and mileage readings.

Other BMW models

3 Series77.7% pass rate · 346,191 tests 11883.0% pass rate · 151,434 tests X185.0% pass rate · 105,826 tests 11678.5% pass rate · 100,371 tests X383.1% pass rate · 88,755 tests 1 Series81.7% pass rate · 77,207 tests X582.4% pass rate · 76,168 tests 5 Series85.7% pass rate · 71,923 tests

FAQs

What is the MOT pass rate for a BMW 420I M Sport Auto?

In 2025, 90.4% of 6,183 first MOT tests on the BMW 420I M Sport Auto were passes (UK average: 77.5%). Data: DVSA anonymised MOT results.

What does the 420I M Sport Auto fail its MOT on most?

The biggest defect group is tyres (91.7% of its recorded defects), followed by visibility.

Is the BMW 420I M Sport Auto reliable?

MOT pass rate is one lens on durability: at 90.4% it performs above the national average at a median age of 3 years and 25,803 miles. Always check the individual car's history too.

Source: DVSA Anonymised MOT tests and results, 2025 extract (Class 4 initial tests only; retests excluded). Contains public sector information licensed under the Open Government Licence v3.0. Figures rounded to one decimal place.