BMW 420i M Sport Auto MOT Pass Rate
Overall pass rate across all manufacture years, based on 5,866 real MOT test results. Failure rate: 8.0%.
Data from official DVSA MOT testing records
BMW 420i M Sport Auto MOT Reliability Overview
The BMW 420i M Sport Auto is a less common vehicle in the UK, with 5,866 MOT test results recorded in our database spanning 3 manufacture years. It has an overall MOT pass rate of 92.0% and a failure rate of 8.0%, which is well above the UK average of approximately 37%.
Based on this data, the BMW 420i M Sport Auto earns a "Excellent" reliability rating. The average BMW 420i M Sport Auto presents for MOT with approximately 23,535 miles on the clock. Manufacture year matters: 2022 models achieve the highest pass rate at 95.8%, while 2021 models have the lowest at 91.8%. This 4.0 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the BMW 420i M Sport Auto is Tyres, affecting 9.9% of all tests. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. The second most common issue is Lamps, reflectors and electrical equipment at 0.9%. Brakes rounds out the top three at 0.8%. Together, these top 3 failure categories account for a significant portion of all MOT failures for this model.
Top failures across all manufacture years combined. Individual year pages may show different top failures.
What Fails Most
Best Year to Buy
📈 How Each Vintage Ages
Pass Rate by Manufacture Year
* High Fail Rate badge indicates an MOT pass rate below 65% (failure rate above 35%).
What Fails on This Car?
Click a category to see specific failure items.
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| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Tyres | 9.9% | 578 |
| 2 | Lamps, Reflectors And Electrical Equipment | 0.9% | 52 |
| 3 | Brakes | 0.8% | 46 |
| 4 | Visibility | 0.8% | 44 |
| 5 | Non-component Advisories | 0.6% | 33 |
| 6 | Identification Of The Vehicle | 0.4% | 23 |
| 7 | Road Wheels | 0.4% | 21 |
| 8 | Seat Belts And Supplementary Restraint Systems | 0.1% | 8 |
| 9 | Suspension | 0.1% | 6 |
Failures per 10,000 Miles
avg. 23,535 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
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| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Tyres | 4.19 | 9.9% | 578 |
| Lamps & Electrical | 0.38 | 0.9% | 52 |
| Brakes | 0.33 | 0.8% | 46 |
| Visibility | 0.32 | 0.8% | 44 |
| Non-component advisories | 0.24 | 0.6% | 33 |
| Identification of the vehicle | 0.17 | 0.4% | 23 |
| Wheels | 0.15 | 0.4% | 21 |
| Seat Belts | 0.06 | 0.1% | 8 |
| Suspension | 0.04 | 0.1% | 6 |
| Body & Structure | 0.02 | 0.0% | 2 |
| Registration Plates and VIN | 0.01 | 0.0% | 2 |
🚗 Similar Cars to Consider
Mileage at MOT
The average BMW 420i M Sport Auto has 23,535 miles when tested for MOT.
📊 Mileage-Adjusted Failure Rate
How often this car fails MOT relative to how much it's driven — a fairer comparison than raw pass rate.
The BMW 420i M Sport Auto has a mileage-adjusted failure rate of 3.40% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About BMW 420i M Sport Auto MOT Data
The BMW 420i M Sport Auto is a less common vehicle in the UK, with 5,866 MOT test results recorded in our database spanning 3 manufacture years. It has an overall MOT pass rate of 92.0% and a failure rate of 8.0%, which is well above the UK average of approximately 37%.
For BMW 420i M Sport Auto owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on tyres and lamps, reflectors and electrical equipment for the best chance of a first-time pass. Use our detailed year-by-year breakdown and failure analysis below to understand how your specific 420i M Sport Auto is likely to perform.
Tyres — 9.9% of failures
Tyres issues account for 9.9% of MOT failures on the BMW 420i M Sport Auto. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. Typical repair costs: £50–200 per tyre. Pre-MOT check: Check tread depth with a 20p coin — if the outer band is visible, the tyre is too worn. Look for bulges, cuts, or embedded objects. Ensure all tyres match the recommended size and load rating.
Lamps, reflectors and electrical equipment — 0.9% of failures
Lamps, reflectors and electrical equipment issues account for 0.9% of MOT failures on the BMW 420i M Sport Auto. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Brakes — 0.8% of failures
Brakes issues account for 0.8% of MOT failures on the BMW 420i M Sport Auto. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Frequently Asked Questions
What is the MOT pass rate for the BMW 420i M Sport Auto?
Based on 5,866 MOT tests in our database, the BMW 420i M Sport Auto has an overall pass rate of 92.0% (8.0% fail rate).
What are the most common MOT failures on a BMW 420i M Sport Auto?
The top 3 reasons a BMW 420i M Sport Auto fails its MOT are: 1. Tyres (9.9%), 2. Lamps, reflectors and electrical equipment (0.9%), 3. Brakes (0.8%). Check these areas before booking your MOT.
Is the BMW 420i M Sport Auto reliable?
With a 8.0% MOT failure rate, the 420i M Sport Auto is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my BMW 420i M Sport Auto?
Based on failure data, focus on: Tyres (9.9%); Lamps, reflectors and electrical equipment (0.9%); Brakes (0.8%). These are the areas most likely to cause a fail. Also check all lights, tyres (minimum 1.6mm tread), and windscreen condition — these are quick wins that apply to all cars.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.