Should I check the MOT history before buying a 2017 BMW 420d M Sport Auto?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2017 BMW 420d M Sport Auto?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2017 BMW 420d M Sport Auto?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

Is the 2017 BMW 420d M Sport Auto reliable?

Based on MOT data from 240 vehicles, the 2017 BMW 420d M Sport Auto has a first-time MOT pass rate of 97.2%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 2017 BMW 420d M Sport Auto?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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BMW 420d M Sport Auto (2017)

240 real MOT outcomes analysed • 97.2% first-time pass rate

2017 BMW 420d M Sport Auto

CarHunch analysed 240 real MOT records for the 2017 BMW 420d M Sport Auto. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

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.

We have limited data for the 2017 BMW 420d M Sport Auto — treat the figures below as indicative rather than definitive.

First-time pass

97.2%

UK average ~80%

Better than average

Dangerous (ever)

At least once in MOT history

Check this vehicle

Avg failures / car

0.08

Over 2.3 tests on record

Low

Typical mileage

59k

Middle half: 47k–70k

For context

These stats describe 240 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

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See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 240 BMW 420d M Sport Auto cars.

Before you buy a 2017 BMW 420d M Sport Auto

Based on MOT data from 240 vehicles — here's what to check.

📋 Check the full MOT history. 0% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Diesel (100%)	239	97.2%	0.08

Colour Breakdown

Based on 1,751 BMW 420d M Sport Auto vehicles registered in the UK — across all years. From DVLA registration records.

White 27.4%

480

Blue 26.7%

468

Grey 17.4%

305

Black 16.3%

285

Red 8.3%

145

Silver 3.9%

Mileage Distribution

Most 2017 BMW 420d M Sport Auto vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

58,687

typical

46,845

low mileage

69,983

high mileage

Half of all 2017 BMW 420d M Sport Auto vehicles fall between 46,845 and 69,983 miles.

Is the mileage you're seeing normal?

✓ Under 46,845 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 46,845–69,983 miles — normal for age. This is where most 2017 BMW 420d M Sport Autos sit.

⚠ Over 94,477 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2017 BMW 420d M Sport Auto — Still on the Road

Almost all 2017 BMW 420d M Sport Autos are 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

2.3

Avg MOT tests per vehicle

0.08

Avg failures per vehicle

Avg advisories per vehicle

Other model years — BMW 420d M Sport Auto: All 420d M Sport Auto years → Which year to buy? →

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Compare with another model

See how the 2017 BMW 420d M Sport Auto stacks up against a rival.

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