Should I check the MOT history before buying a 2018 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 2018 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 2018 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.

How many 2018 Mazda 3 vehicles have had dangerous defects recorded?

24% of these vehicles have had a dangerous defect recorded. Search the registration on CarHunch — the full MOT history will show exactly what was flagged and whether it was resolved.

Is the 2018 Mazda 3 reliable?

Based on MOT data from 6,996 vehicles, the 2018 Mazda 3 has a first-time MOT pass rate of 89.4%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2018 Mazda 3?

The most frequently recorded MOT issues on the 2018 Mazda 3 are: Front Brake pad(s) wearing thin (42.3% of vehicles), Nearside Front Tyre worn close to legal limit/worn on edge (37.5% of vehicles), Offside Front Tyre worn close to legal limit/worn on edge (36.9% 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 2018 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 (2018)

6,996 real MOT outcomes analysed • 89.4% first-time pass rate

2018 Mazda 3

CarHunch analysed 6,996 real MOT records for the 2018 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? →

On this page

AI Analysis Reliability Overview Common Issues Check a Specific Reg Petrol vs Diesel Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2018 Mazda 3 passes its MOT first time at 89.4%, which is notably stronger than the UK average of 80%—a real strength for the model. However, nearly a quarter of these cars (23.6%) have recorded at least one dangerous defect during their MOT history, which is a material concern for any buyer and worth investigating on a specific vehicle's history.

At an average mileage of 35,394 miles for a six-year-old car, these Mazdas are running slightly below typical use, which often correlates with better condition. The petrol versions hold a slight edge over diesel (89.7% versus 86.0% pass rate), and with an average of 0.72 failures per vehicle, most cars need only minor work—but check the full MOT history of any car you're considering, particularly around those dangerous defect flags.

The 2018 Mazda 3 passes its MOT first time at roughly the UK average rate (89.4%) — solid but worth checking this vehicle's history carefully.

⚠️ Over 1 in 5 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

89.4%

UK average ~80%

Better than average

Dangerous (ever)

23.6%

At least once in MOT history

Check this vehicle

Avg failures / car

0.72

Over 5.8 tests on record

Moderate

Typical mileage

32k

Middle half: 24k–42k

For context

✅ Good baseline reliability. A 89.4% 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 6.1 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 6,996 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.

Average reliability — agree?

What tends to go wrong

Across 6,996 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Brake wear 42.3%

Front Brake pad(s) wearing thin · Rear Brake pad(s) wearing thin · Offside Front Brake pipe corroded, covered in grease or other material · …

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

Tyre wear 37.5%

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

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

Suspension & steering 24.5%

Offside Rear Coil spring fractured or broken · Nearside Rear Coil spring fractured or broken

Harder to spot without a ramp — this is a good reason to book a pre-purchase inspection.

Other issues 13%

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

Data covers a 3-year window centred on 2018.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 6,996 Mazda 3 cars.

Petrol vs Diesel

Pass rate difference of 3.7 percentage points — worth knowing if you're choosing between the two.

89.7%

Petrol

6,425 vehicles

86%

Diesel

571 vehicles

Before you buy a 2018 Mazda 3

Based on MOT data from 6,996 vehicles — here's what to check.

📋 Check the full MOT history. 23.6% 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 (92%)	6,425	89.7%	0.7
Diesel (8%)	571	86%	0.97

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 2018 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.

32,216

typical

23,584

low mileage

41,755

high mileage

Half of all 2018 Mazda 3 vehicles fall between 23,584 and 41,755 miles.

Is the mileage you're seeing normal?

✓ Under 23,584 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.

✓ 23,584–41,755 miles — normal for age. This is where most 2018 Mazda 3s sit.

⚠ Over 56,369 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2018 Mazda 3 — Still on the Road

Almost all 2018 Mazda 3s are still on the road.

Strong survival — 6,848 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 2021–2025.

MOT History Averages

5.8

Avg MOT tests per vehicle

0.72

Avg failures per vehicle

6.1

Avg advisories per vehicle

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

2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2019 2020 2021 2022 2023

Or browse all models: Mazda →

Compare with another model

See how the 2018 Mazda 3 stacks up against a rival.

Average reliability — agree?