Model Reports 5 min read Updated 18 Oct 2026

Mazda 3 2012: reliability & common MOT faults

In 2025, 63 in every 100 first MOTs on a 2012 Mazda 3 were passes. Most common reason for a fail: Suspension arm ball joint (front).

Summary

The 2012 Mazda 3 follows the pattern of the model years either side.

At a glance

How 4,536 first tests went in 2025.

Passed first time
63 in every 100
Did not pass first time
37 in every 1001,681 failed first-attempt tests
The typical car
13 yearsabout 92,055 miles
First tests counted
4,536

What failed most often

  1. Suspension arm ball joint (front)22 in every 100 failed tests
  2. Individual sidelight or tail light (front)18 in every 100 failed tests
  3. Tyre condition (front)8 in every 100 failed tests

How we count this. Data: UK MOT open data, 2025. Only Class 4 cars on their first MOT of the year are counted. A car that fails and is fixed at the test station still counts as a fail in the first-attempt rate. These are raw results, not adjusted for age, mileage, or peer mix. The MOT does not test engine or gearbox internals.

Note:

These are patterns across 2012 Mazda 3 vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. A wear pattern follows age and use more than the way the car was built. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Suspension

Two faults. The strongest is the anti-roll bar linkage ball joints (rear): 8.9 times as often as on similar cars.

Figures below are measured across the 1,679 of 1,681 failed first attempts (99.9%) that recorded an odometer reading in 2025. Mileage is needed to compare like with like.

We only list faults with at least 20 failures and a rate of about 2.0 times that of similar cars, which keeps one-off results out of the list.

Anti-roll bar linkage ball joints (rear)

Failed on 70 first tests8.9 times as often as similar carsLikely evidence

What it means

Excessive wear on an anti-roll bar linkage ball joint is Major. A joint likely to become detached is graded Dangerous.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 160 first tests, 13 times as often as on similar cars.

Suspension arm ball joint (front)

Failed on 373 first tests3.1 times as often as similar carsLikely evidence

What it means

A suspension arm ball joint is failed under the general suspension pin, bush or joint wording. Excessively worn is Major, and likely to become detached is graded Dangerous.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage. Advisories count notes recorded on failed first tests only.

Lamps and electrical

One fault: reversing lights, 3.7 times as often as on similar cars.

Reversing lights

Failed on 40 first tests3.7 times as often as similar carsLikely evidence

What it means

Reversing lamps must show a white light to the rear, and on some vehicles the engine has to be running before they work. A lamp that does not emit a steady white light, does not face the rear or has its light intensity significantly reduced is Major. A lamp not securely attached is Minor, but one likely to become detached is Major.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.

Brakes

One wear pattern: brake pads (rear), 2.1 times as often as on similar cars.

Brake pads (rear)

Failed on 122 first tests2.1 times as often as similar carsWear pattern

What it means

A pad worn down to its wear indicator, or contaminated with oil or grease, is Major. A pad worn below the set thickness limit, missing or incorrectly mounted is Dangerous. The manual treats an illuminated brake wear indicator as no reason for failure, although DVSA also lists an illuminated indicator as a Major row.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.

Advisories

Other things testers noted as worn or close to failing, more often than on similar cars.

An advisory is a note from the tester about something that has not failed yet. It is an early warning, not a fail. Advisories for the faults above are shown with those faults.

Anti-roll bar ball joint (rear)

Noted on 45 first tests20 times as often as similar carsPossible evidence

Suspension arm (rear)

Noted on 229 first tests7.2 times as often as similar carsElevated evidence

Structural sub-frame condition (rear)

Noted on 24 first tests6.8 times as often as similar carsElevated evidence

Suspension sub-frame (rear)

Noted on 329 first tests4.7 times as often as similar carsElevated evidence

Suspension sub-frame (front)

Noted on 179 first tests3.9 times as often as similar carsElevated evidence

Suspension sub-frame mounting area (rear)

Noted on 20 first tests3.5 times as often as similar carsElevated evidence

Other suspension component (rear)

Noted on 28 first tests3.5 times as often as similar carsElevated evidence

Data: UK MOT open data, 2025. Counts cover advisories recorded on failed first tests only, compared with cars of the same age and mileage.

MOT pass rates

How first tests ended, and how the pass rates are counted.

Passed first time
63in every 100
Passed on the first test.
Fixed at the station
7in every 100
Failed, then fixed at the test station the same day.
Failed
30in every 100
Did not pass, and were not fixed at the test station.

First-attempt pass 62.9% of 4,536 first tests (2025): only cars that passed first time count. Official-style pass 70.0%: cars fixed at the test station also count as a pass. The 7 fixed and the 30 not fixed make the 37 in every 100 that did not pass first time.

Petrol and diesel

First testsTypical mileagePassed first time, as testedPassed first time, same mileage
Petrol3,07384,390 miles6462
Diesel1,462107,869 miles6064

Figures are in every 100 first tests. Cars with more miles usually fail more often, so the same-mileage figure gives every fuel the mileage mix of all the cars in this year.

Same model, other years

Passed first time in every 100, all tested in 2025.

4060801002005201220152020Older carsNewer cars
40608010020122020Older carsNewer cars

Newer cars are younger, so look for a jump rather than the climb. A year earlier (2024), when these cars were a year younger, 65 in every 100 passed first time.

YearPassed first timeFirst tests
200452 in every 100527
200547 in every 1001,851
200650 in every 1002,787
200751 in every 1004,012
200850 in every 1005,080
200956 in every 1006,367
201057 in every 1007,309
201156 in every 1004,922
2012 This car63 in every 1004,536
201368 in every 1004,879
201470 in every 1007,914
201570 in every 10011,187
201673 in every 10010,120
201774 in every 1007,934
201883 in every 1006,846
201987 in every 1004,329
202087 in every 1004,157
202189 in every 1003,964
202292 in every 1002,415

If you are buying one

What this year's MOT record means for the decision in front of you.

Mileage matters most on a 2012 Mazda 3.

Of 2012 Mazda 3 vehicles with under 66,000 miles, 77 in every 100 passed their 2025 MOT first time. With 120,000 miles or more, 54 in every 100 did.

Under 66,000921 tests
77
66,000–83,000868 tests
68
83,000–100,000 Typical car910 tests
59
100,000–120,000931 tests
56
120,000 and over901 tests
54

Petrol or diesel?

Typical mileagePassed first time,
as tested		Passed first time,
same mileage
Petrol84,390 miles6462
Diesel107,869 miles6064

Figures are in every 100 first tests. Petrol cars look better on the raw figures only because diesel cars have done more miles (typically 107,869 against 84,390). At the same mileage there is no clear difference between the two.

What to check at your mileage

How often each fault turned up on a failed first test, by the car's mileage. Read it as: what is likely to need looking at on a car like the one in front of you.

Under 66,00083,000–100,000120,000 and over
Suspension arm ball joint (front)3.09.311.2
Individual sidelight or tail light (front)1.58.112.8
Tyre condition (front)1.42.33.7
Brake pads (rear)0.93.73.1
Tyre tread depth (front)0.93.24.0

Faults per 100 first tests, by the car's mileage at the test.

When a car fails

35in every 100

of failed cars had one item to fix.

37in every 100

of failed cars had three or more items to fix.

11in every 100

of all first tests had a defect the tester marked dangerous (unsafe to drive away).

Every figure here is a first-attempt MOT rate from DVSA open data for this model line, for cars of this model year tested in 2025. Each mileage band holds a fifth of the tests. MOTs do not test engine or gearbox internals, so this is a pre-purchase checklist, not a full reliability score.

FAQs

Short answers about how to read this model-year guide.

The 2012 Mazda 3 follows the pattern of the model years either side. Its main cause of failure was Suspension arm ball joint (front), about 22 in every 100 failed tests. In 2025, 62.9% of 4,536 first MOTs on the 2012 Mazda 3 passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 70.0%. Among 1,681 failed first-attempt MOT tests (test year 2025), Anti-roll bar linkage ball joints (rear) appears more often than on similar cars (4.2% of those tests; 70 observed failures; about 8.9× more often than similar cars). There is no single reliability score here; this is a pre-purchase checklist built from DVSA open data, not a guarantee for any individual car.
Ranked by how often they were actually recorded, the items that most often failed a 2012 Mazda 3 at the first attempt were Suspension arm ball joint (front) (22.2%), Individual sidelight or tail light (front) (17.7%) and Tyre condition (front) (7.9%), each as a share of the year's failed first attempts. That is what goes wrong most often on the car. The common faults table shows a different measure: faults that are unusual compared with similar cars.
Among failed first-attempt tests we highlight patterns that appear more often than on similar cars. Top example: Anti-roll bar linkage ball joints (rear) (4.2% of those tests; 70 observed failures; about 8.9× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
Anti-roll bar linkage ball joints (rear) shows up more often than on similar cars (4.2% of those tests; 70 observed failures; about 8.9× more often than similar cars). That does not prove a design fault. Age, mileage, and how the car was used still matter. Treat it as a pre-purchase checkpoint, not a manufacturer service bulletin.
Common MOT problem areas for the 2012 Mazda 3 include Anti-roll bar linkage ball joints (rear), Reversing lights, Suspension arm ball joint (front). These are the faults that stand out compared with similar cars, not a complete list of what can go wrong on any individual car.
Advisories flag issues noted at the test and are not a fail rate. We show advisory patterns that appear more often than on similar cars among failed first-attempt tests, separate from common failure rows. Use them as early-warning checks, not as a pass/fail score.
This page highlights MOT failure patterns for the 2012 Mazda 3 (registration year) using UK DVSA open data for the selected test year. Patterns are compared with cars of a similar age and mileage. It is a buyer checklist from MOT defect statistics, not a full service history or manufacturer service-bulletin list.
No. MOT tests do not cover engine internals, gearboxes, or many electronic modules. Patterns here come from MOT defect statistics only and should not be read as engine or gearbox reliability scores.

About this data

How this page is built and what it can (and can't) say.

These figures come from UK MOT open data for this model year. We surface common failure patterns against similar cars, not a full reliability score, and not a pass/fail verdict on any individual vehicle.

2024 2025

What we include

UK Class 4 cars only. Normal MOT tests (not retests); first test per vehicle per calendar year; results pass, PRS, or fail.

Same-day repairs

PRS means the car failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.

How we compare

We compare this model year with other Class 4 cars of similar age and mileage in the same test year. This model family is left out of the peer group so the car is not measured against itself.

What this does not cover

  • MOTs do not cover engine internals, gearboxes, or many electronics; this is not a full reliability score.
  • Common faults come from MOT defect stats, not manufacturer TSBs or recalls.
  • Age and mileage matching reduces, but does not remove, differences in how cars were used and maintained.
  • If the data for a car is too thin to say anything useful, we say so rather than guess.

Contains public sector information licensed under the Open Government Licence v3.0.

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