MOT cost .
Mazda 3
MOT 2023
Wikimedia

Mazda

3

136,846 MOT tests analysed. lands in the middle of the pack — here's where 3s pass, fail, and end up on the retest sheet.

That's 1.7 points below the UK fleet average across our 1,988 tracked models — buyers should expect more first-time fails than the typical UK car.

Pass

74.0%

Pass-after-fix

4.4%

Fail

21.1%

Avg miles

73,936

Pass + Pass-after-fix + Fail = 100%

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.

Top ten reasons for rejection.

  1. 01

    A spring or spring component fractured or seriously weakened

    5,573 occurrences · 4.1% of tests

  2. 02

    A suspension pin, bush or joint excessively worn

    5,051 occurrences · 3.7% of tests

  3. 03

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

    4,780 occurrences · 3.5% of tests

  4. 04

    Headlamp reflector or lens slightly defective

    3,997 occurrences · 2.9% of tests

  5. 05

    a brake lining or pad worn below 1.5mm

    3,935 occurrences · 2.9% of tests

  6. 06

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

    3,732 occurrences · 2.7% of tests

  7. 07

    Tyre tread depth not in accordance with the requirements

    3,718 occurrences · 2.7% of tests

  8. 08

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

    2,998 occurrences · 2.2% of tests

  9. 09

    Engine MIL illuminated indicating a malfunction

    2,061 occurrences · 1.5% of tests

  10. 10

    A suspension pin, bush or joint excessively worn

    2,003 occurrences · 1.5% 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.

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

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.

Recent owner-reported faults

  1. 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

  2. 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

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.