Should I check the MOT history before buying a 2021 Mazda 3?

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 Mazda 3?

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 Mazda 3?

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 Mazda 3 reliable?

Based on MOT data from 3,820 vehicles, the 2021 Mazda 3 has a first-time MOT pass rate of 92.9%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2021 Mazda 3?

The most frequently recorded MOT issues on the 2021 Mazda 3 are: Front Brake pad(s) wearing thin (20.3% of vehicles), Nearside Rear Tyre slightly damaged/cracking or perishing (18.5% of vehicles), Offside Rear Tyre slightly damaged/cracking or perishing (18.3% of vehicles). These figures are based on actual MOT test records — search a specific registration on CarHunch to see its individual history.

Do I need an HPI check when buying a 2021 Mazda 3?

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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Mazda 3 (2021)

3,820 real MOT outcomes analysed • 92.9% first-time pass rate

2021 Mazda 3

CarHunch analysed 3,820 real MOT records for the 2021 Mazda 3. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

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AI Analysis Reliability Overview Common Issues Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution MOT Averages Colour Breakdown Compare Models

The 2021 Mazda 3 is a reliably built car, with a first-time MOT pass rate of 92.9% — well above the UK average of 80%. Only 8.1% of vehicles analysed have ever recorded a dangerous defect, which is reassuringly low and shouldn't deter buyers.

At a median mileage of 24,561 miles, these cars have been driven moderately for their age, and the low failure rate of 0.23 per vehicle suggests Mazda's engineering is holding up well. The average of 1.8 advisories per test indicates minor wear is normal, but if you're viewing one of these used, ask the seller for the full MOT history to spot any pattern of recurring issues.

The 2021 Mazda 3 passes its MOT first time more often than most UK vehicles (92.9% 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

92.9%

UK average ~80%

Better than average

Dangerous (ever)

8.1%

At least once in MOT history

Check this vehicle

Avg failures / car

0.23

Over 2.3 tests on record

Low

Typical mileage

25k

Middle half: 17k–33k

For context

✅ Good baseline reliability. A 92.9% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

🔧 Expect consumable spend. An average of 1.8 advisories per vehicle tells you wear items (tyres, brakes) get flagged regularly. Budget for them — they're not surprises.

🔍 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 3,820 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.

A solid choice — agree?

What tends to go wrong

Across 3,820 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Brake wear 20.3%

Front Brake pad(s) wearing thin · Rear Brake disc worn, pitted or scored, but not seriously weakened · Offside Rear Brake disc worn, pitted or scored, but not seriously weakened · …

Ask the seller when brakes were last serviced. If they don't know, factor in the cost.

Tyre wear 18.5%

Nearside Rear Tyre slightly damaged/cracking or perishing · Offside Rear Tyre slightly damaged/cracking or perishing · Nearside Front Tyre worn close to legal limit/worn on edge · …

Budget for a full set — on a vehicle this age, tyres are expected consumables. An inspection will confirm how much is left.

Other issues 4.5%

Nearside Rear Child Seat fitted not allowing full inspection of adult belt

Lighting 3.5%

Nearside Front Road wheel slightly distorted

Usually cheap to fix. Worth confirming all lights work before collecting.

Data covers a 3-year window centred on 2021.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 3,820 Mazda 3 cars.

Before you buy a 2021 Mazda 3

Based on MOT data from 3,820 vehicles — here's what to check.

📋 Check the full MOT history. 8.1% 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 (100%)	3,810	92.9%	0.23

Colour Breakdown

Based on 162,087 Mazda 3 vehicles registered in the UK — across all years. From DVLA registration records.

Blue 23.1%

37,420

Grey 19%

30,747

Silver 18.1%

29,403

Red 16.5%

26,683

Black 13.2%

21,382

White 9.4%

15,266

Green 0.4%

671

Purple 0.3%

449

Bronze 0%

Brown 0%

Multi-colour 0%

Maroon 0%

Mileage Distribution

Most 2021 Mazda 3 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.

24,561

typical

17,316

low mileage

33,000

high mileage

Half of all 2021 Mazda 3 vehicles fall between 17,316 and 33,000 miles.

Is the mileage you're seeing normal?

✓ Under 17,316 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.

✓ 17,316–33,000 miles — normal for age. This is where most 2021 Mazda 3s sit.

⚠ Over 44,550 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

MOT History Averages

2.3

Avg MOT tests per vehicle

0.23

Avg failures per vehicle

1.8

Avg advisories per vehicle

Other model years — Mazda 3: All 3 years → Which year to buy? →

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Or browse all models: Mazda →

Compare with another model

See how the 2021 Mazda 3 stacks up against a rival.

A solid choice — agree?