Performance by cohort

3 year bands · 188,985 tests

Pass rate climbs 18.9 points across the cohorts — newer 3 examples clear the test more reliably than the early cars.

Pre-2018 cohort 161,802

Pass

72.0%

Fail

22.8%

PRS

4.6%

Avg mileage at test

84,022 mi

2018–2020 cohort 20,379

Pass

88.7%

Fail

7.9%

PRS

3.2%

Avg mileage at test

34,659 mi

2021+ cohort 6,804

Pass

90.9%

Fail

5.8%

PRS

3.1%

Avg mileage at test

23,332 mi

Cohort = vehicle's first-registration year band. Same model, different generations of build.

Generations on file · 4

Mazda 3 · UK market

Photos: Wikimedia Commons · CC BY-SA / CC BY / public domain.

The picture

74.01% pass rate — springs and bushes at 73k miles

Spring fractures and suspension pin or bush wear top the Mazda 3's MOT failure chart, across 136,846 tests at an average presenting mileage of 73,936. A 74.01% pass rate puts the Mazda 3 slightly below the compact family car average — respectable enough, but with a consistent suspension story that repeats across the model range.

Owner reports add technical detail. The Skyactiv-X mild hybrid engine can misfire under gentle driving between 1,600 and 2,300 rpm in third, fourth, or fifth gear — one owner eventually secured authorisation from Germany for a new short engine on a sub-28,000 mile car. Early 2019 models reported i-stop and charging system faults triggering dashboard warnings to stop driving. Both issues are engine-related rather than MOT-critical, but they signal that Mazda's ambition with Skyactiv technology outpaced its reliability. Pre-MOT, address the springs and suspension joints. That's where the tester will spend most of the inspection.

ABI Insurance Group

Group 12–26

Below the fleet average — generally reasonable to insure. Lower groups cost less to insure; UK fleet average is around Group 22.

Source: ABI Group Rating Panel · administered by Thatcham Research · groups cover standard variants; performance trims may sit higher. Browse all insurance groups →

12–26

out of 50

Compare quotes →

Top ten reasons for rejection.

Filter failures:

Hide wear items to see the model's real defects.

01

A suspension pin, bush or joint excessively worn

5,530 occurrences · 2.9% of tests
02

A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources

5,484 occurrences · 2.9% of tests
03

A spring or spring component fractured or seriously weakened

5,203 occurrences · 2.8% of tests
04

Headlamp reflector or lens slightly defective

5,005 occurrences · 2.6% of tests
05

a brake lining or pad worn below 1.5mm

4,357 occurrences · 2.3% of tests
06

A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

4,155 occurrences · 2.2% of tests
07

Tyre tread depth not in accordance with the requirements

3,843 occurrences · 2.0% of tests
08

Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view

3,262 occurrences · 1.7% of tests
09

A suspension pin, bush or joint excessively worn

2,524 occurrences · 1.3% of tests
10

Engine MIL illuminated indicating a malfunction

2,235 occurrences · 1.2% of tests

Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.

Worst-case fix budget · top 5 failures

£258–£755

If every one of this 3's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →

Try the calculator

Build your own retest budget.

Year-band analysis

Best year to buy. Worst to avoid.

First-time MOT pass rate split by registration band. A 18.9-point gap between bands means the year you buy Mazda 3 has a real effect on what turns up at the garage.

Best band to buy

90.9%

2021+ registration

the 2021-on band climbs to 90.9% — a 18.9-point improvement. Tests in this band average 23,332 miles — roughly 61K miles fewer on the clock than the older band. Failures here are mostly wear items: has a bulge, caused by separation or…, has a cut in excess of the… — the structural issues that drag down older examples don't appear in the top-10 for this band. Post-2020 examples are early in their MOT life and generally show the cleanest records.

Band to be cautious about

72.0%

Pre-2018 registration

On the older band (pre-2018), the data shows a 72.0% pass rate against a fleet average of 90.9% on the newer band. The main culprits logged at test: ball joint excessively worn, inoperative in the case of multiple lamps…, and fractured or broken. Average mileage on test for this band is 84,022 miles — high-mileage wear items are a recurring theme.

Best band to buy: 2021+ (90.9% first-time pass). Worst band to avoid: pre-2018 (72.0% pass). That's a 18.9-point spread across 161,802 older tests and 6,804 newer ones — year of build makes a material difference on this model.

Year-spread leaderboard →

Tools that pre-empt a retest.

Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.

Item 01 · Amazon UK

H7 / W21W bulb pack

A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.

Search Amazon UK

Item 02 · Amazon UK

Headlight restoration kit

Yellowed lenses fail the light-output test. A restoration kit lifts the haze in an afternoon for £20.

Search Amazon UK

Item 03 · Amazon UK

Brake pad measurement gauge

Testers fail pads under 1.5mm. A wear gauge tells you if you've got two months left or two weeks.

Search Amazon UK

My Motor World · affiliate

Parts & supplies for this fix

Affiliate links — small commission, no extra cost to you.

Draper

Draper Drain Plug Key, 3/8 Square x 3/8 Sq. Dr.

£15.39

View at My Motor World →

Hycote

Hycote Mazda Silver Stone Double Acrylic Spray Paint 150ml

£6.59

View at My Motor World →

Autotek

Autotek Mazda Arctic White 300ml

£14.29

View at My Motor World →

Autotek

Autotek Mazda Brilliant Black 300ml

£14.29

View at My Motor World →

Click Mechanic · affiliate

Book a mobile mechanic

Affiliate links — small commission, no extra cost to you.

Mobile mechanic · UK-wide

Book a mechanic at your door.

Fixed-price quotes upfront. No garage needed. Click Mechanic sends a vetted local mechanic to you — home, work, or roadside.

Get a quote →

Owner reports · Honest John

What owners actually report.

Verbatim faults logged by owners on honestjohn.co.uk over recent years. We didn't summarise — these are the words people typed in.

Where it falls short

Owner reports (2 entries) flag recurring problems with electrical faults, battery/electrical.

Recent owner-reported faults

30 Oct 2023
Mazda 3 models with the Skyactiv-x MHEV engine can suffer from a misfire under gentle driving (1600 - 2300 rpm in 3rd/4th/5th gear). One reader managed (after much work) to get authorisation from Germany for a new short engine. Car was less than four years and had under 28,000 miles. * Terms and Conditions * Privacy * Cookies * Advertise on this site * Contact * Mobile) Website of the Year 2016, 2017 & 2018
11 Sep 2019
Report of problems with the i stop system of new 2019 Mazda 3 malfunctioning every day and the charging system failing regularly. Both faults flagged up dashboard warnings to stop using the car and have them checked and rectified. Owner kept the car for two weeks and then successfully rejected it and received a full refund. Dealer denied faults at first and also initially refused to accept owner's right to reject within 30 days. He had to engage an expensive consumer rights lawyer to back up his rejection rights under the Consumer Rights Act 2015. Owner also complained that car hads been delivered with a scrateched instrumnent panel and scratched piano black centre console.

Source: honestjohn.co.uk · 2 reports indexed

Recall history

7 UK recalls on record.

The 3 has 7 official UK vehicle recalls covering defect details, remedies, and affected build dates.

See all recalls

Buying or keeping a 3?

Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.

If you own a 3 and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.