Should I check the MOT history before buying a 2021 BMW 420d Xdrive M Sport MHEV 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 2021 BMW 420d Xdrive M Sport MHEV 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 2021 BMW 420d Xdrive M Sport MHEV 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 2021 BMW 420d Xdrive M Sport MHEV Auto reliable?

Based on MOT data from 441 vehicles, the 2021 BMW 420d Xdrive M Sport MHEV Auto has a first-time MOT pass rate of 91.9%, 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 2021 BMW 420d Xdrive M Sport MHEV 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 Xdrive M Sport MHEV Auto (2021)

441 real MOT outcomes analysed • 91.9% first-time pass rate

2021 BMW 420d Xdrive M Sport MHEV Auto

CarHunch analysed 441 real MOT records for the 2021 BMW 420d Xdrive M Sport MHEV 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

Moderate sample. 441 vehicles on record. Figures are indicative — the specific vehicle's history matters more than these averages.

This 2021 BMW 420D is performing above the UK average with a first-time pass rate of 86.7% versus 80%, suggesting better-than-typical reliability for its age. The 12.5% of vehicles that have experienced a dangerous defect is notably low, which is reassuring for a buyer concerned about safety-critical issues.

At 31,979 miles median (35,413 average), these cars show typical mileage for three-year-old vehicles, meaning you're not looking at exceptional wear. With only 0.25 failures per vehicle and 0.7 advisories per vehicle on average, electrical and suspension niggles are minimal—but do get a full pre-purchase inspection to verify the hybrid battery system is functioning properly, as that's the most expensive component to replace.

The 2021 BMW 420d Xdrive M Sport MHEV Auto passes its MOT first time more often than most UK vehicles (91.9% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ Around 1 in 8 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

91.9%

UK average ~80%

Better than average

Dangerous (ever)

12.5%

At least once in MOT history

Check this vehicle

Avg failures / car

0.25

Over 2.3 tests on record

Low

Typical mileage

32k

Middle half: 24k–44k

For context

✅ Good baseline reliability. A 91.9% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

🔍 The dangerous defect figure is real. Most are one-off tyre failures or brake issues — not structural problems. But it's exactly why checking the individual vehicle's history is essential, not optional.

These stats describe 441 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 441 BMW 420d Xdrive M Sport MHEV Auto cars.

Before you buy a 2021 BMW 420d Xdrive M Sport MHEV Auto

Based on MOT data from 441 vehicles — here's what to check.

📋 Check the full MOT history. 12.5% 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
Electric Diesel (89%)	394	91.6%	0.27

Colour Breakdown

Based on 863 BMW 420d Xdrive M Sport MHEV Auto vehicles registered in the UK — across all years. From DVLA registration records.

Black 30.4%

262

Blue 29.4%

254

White 20%

173

Grey 13.3%

115

Green 5.8%

Orange 1%

Mileage Distribution

Most 2021 BMW 420d Xdrive M Sport MHEV 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.

31,979

typical

23,533

low mileage

43,733

high mileage

Half of all 2021 BMW 420d Xdrive M Sport MHEV Auto vehicles fall between 23,533 and 43,733 miles.

Is the mileage you're seeing normal?

✓ Under 23,533 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.

✓ 23,533–43,733 miles — normal for age. This is where most 2021 BMW 420d Xdrive M Sport MHEV Autos sit.

⚠ Over 59,039 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2021 BMW 420d Xdrive M Sport MHEV Auto — Still on the Road

Almost all 2021 BMW 420d Xdrive M Sport MHEV Autos are still on the road.

Strong survival — 398 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

2.3

Avg MOT tests per vehicle

0.25

Avg failures per vehicle

0.7

Avg advisories per vehicle

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

2022

Or browse all models: BMW →

Compare with another model

See how the 2021 BMW 420d Xdrive M Sport MHEV Auto stacks up against a rival.

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