Should I check the MOT history before buying a 2021 BMW M135i Xdrive 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 M135i Xdrive 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 M135i Xdrive 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 M135i Xdrive Auto reliable?

Based on MOT data from 3,267 vehicles, the 2021 BMW M135i Xdrive Auto has a first-time MOT pass rate of 93.7%, 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 M135i Xdrive 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 M135i Xdrive Auto (2021)

3,267 real MOT outcomes analysed • 93.7% first-time pass rate

2021 BMW M135i Xdrive Auto

CarHunch analysed 3,267 real MOT records for the 2021 BMW M135i Xdrive 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

The 2021 BMW M135i xDrive is a notably reliable performer, with a 92.0% first-time MOT pass rate that sits 12 percentage points above the UK average of 80%—a strong signal of engineering quality and owner maintenance standards. The 9.7% rate of dangerous defects is acceptably low, so safety concerns shouldn't deter a buyer.

These cars are running at modest mileage for their age, with a median of 26,736 miles, suggesting they're either well-preserved or lightly driven. The average 0.21 failures per vehicle and 1.2 advisories per vehicle indicate that when problems do arise, they're typically minor wear items rather than systemic issues—so if you're buying one, a pre-purchase inspection focusing on suspension and brake components (the usual culprits in 1.2-advisory territory) will give you confidence.

The 2021 BMW M135i Xdrive Auto passes its MOT first time more often than most UK vehicles (93.7% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ About 1 in 12 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

93.7%

UK average ~80%

Better than average

Dangerous (ever)

9.7%

At least once in MOT history

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Avg failures / car

0.21

Over 2.4 tests on record

Low

Typical mileage

27k

Middle half: 20k–34k

For context

✅ Good baseline reliability. A 93.7% 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 3,267 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 3,267 BMW M135i Xdrive Auto cars.

Before you buy a 2021 BMW M135i Xdrive Auto

Based on MOT data from 3,267 vehicles — here's what to check.

📋 Check the full MOT history. 9.7% 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
Petrol (98%)	3,204	93.6%	0.21
Other (2%)	63	100%	0

Colour Breakdown

Based on 15,172 BMW M135i Xdrive Auto vehicles registered in the UK — across all years. From DVLA registration records.

Grey 40%

6,074

Black 19.8%

2,998

White 17.9%

2,720

Blue 16.9%

2,564

Red 4%

614

Green 0.5%

Purple 0.3%

Yellow 0.3%

Orange 0.2%

Mileage Distribution

Most 2021 BMW M135i Xdrive 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.

26,736

typical

20,415

low mileage

34,458

high mileage

Half of all 2021 BMW M135i Xdrive Auto vehicles fall between 20,415 and 34,458 miles.

Is the mileage you're seeing normal?

✓ Under 20,415 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.

✓ 20,415–34,458 miles — normal for age. This is where most 2021 BMW M135i Xdrive Autos sit.

⚠ Over 46,518 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 M135i Xdrive Auto — Still on the Road

Almost all 2021 BMW M135i Xdrive Autos are still on the road.

Strong survival — 3,134 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

2.4

Avg MOT tests per vehicle

0.21

Avg failures per vehicle

1.2

Avg advisories per vehicle

Other model years — BMW M135i Xdrive Auto: All M135i Xdrive Auto years → Which year to buy? →

2019 2020 2022 2023 2024

Or browse all models: BMW →

Compare with another model

See how the 2021 BMW M135i Xdrive Auto stacks up against a rival.

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