BMW 420i M Sport Pro Edition Auto (2021)
2021 BMW 420i M Sport Pro Edition Auto
CarHunch analysed 278 real MOT records for the 2021 BMW 420i M Sport Pro Edition Auto. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2021 BMW 420i M Sport Pro Edition is a reliable performer, with a 90.6% first-time pass rate that sits well ahead of the UK average of 80%—and importantly, only 14.4% of vehicles have ever recorded a dangerous defect, which is comfortably below the concern threshold. The petrol engines show consistent results across the cohort at 90.2% pass rate.
At a median mileage of 25,358 miles for a 2021 model, these cars are running lightly, which explains the low failure rate of just 0.24 per vehicle on average. Most cars rack up minor advisory issues (0.8 per vehicle on average), typical wear items rather than structural problems—so when shopping for one, get a pre-purchase inspection to confirm that any advisories flagged have been addressed, and you'll have a solid used buy.
What to check before buying a 2021 BMW 420i M Sport Pro Edition Auto
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a BMW 420i M Sport Pro Edition Auto
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (96%) | 268 | 90.2% | 0.25 |
| Other (4%) | 10 | 100% | 0 |
Mileage Distribution
Most 2021 BMW 420i M Sport Pro Edition Auto vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2021 BMW 420i M Sport Pro Edition Auto vehicles fall between 19,086 and 34,746 miles.
2021 BMW 420i M Sport Pro Edition Auto — Still on the Road
Strong survival — 262 vehicles still getting MOTs in 2025, 100% of the peak.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2023–2025.
MOT History Averages
Found a specific BMW 420i M Sport Pro Edition Auto?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.