BMW 420d M Sport Auto (2017)
2017 BMW 420d M Sport Auto
CarHunch analysed 240 real MOT records for the 2017 BMW 420d M Sport Auto. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
This 2017 BMW 420D M Sport has a first-time MOT pass rate of 62%, which is 18 percentage points below the UK average of 80%—a genuine concern for reliability. The good news is that dangerous defects are extremely rare (0%), and when failures do occur, they're infrequent at just 0.08 per vehicle on average.
These cars are running at a sensible 58,687 miles median for their age, so you're not looking at high-mileage examples, yet the poor pass rate suggests inherent mechanical vulnerabilities rather than wear-and-tear issues. Before committing to a purchase, budget for a thorough pre-buy inspection by a BMW specialist, as this cohort clearly needs closer scrutiny than most rivals.
What to check before buying a 2017 BMW 420d M Sport 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 420d M Sport 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 |
|---|---|---|---|
| Diesel (100%) | 239 | 61.8% | 0.08 |
| Gas Bi-Fuel (0%) | 1 | 100% | 0 |
Mileage Distribution
Most 2017 BMW 420d M Sport 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 2017 BMW 420d M Sport Auto vehicles fall between 46,845 and 69,983 miles.
2017 BMW 420d M Sport Auto — Still on the Road
Strong survival — 95 vehicles still getting MOTs in 2025, 97% of the peak.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2021–2025.
MOT History Averages
Found a specific BMW 420d M Sport Auto?
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