Model Reports 8 min read Updated 11 Sep 2026 DVSA open data · 2,450 tests analysed

Mazda 6 2012: reliability & common MOT faults

977 first-attempt MOT failures were recorded on the 2012 Mazda 6 in 2025. The items recorded most often on them were Position lamp (front) and Rbt (sp). Figures are among first-attempt failed MOT tests, not among all tests.

Petrol 6 passed first time 4.5 pp more often than diesel ones (62.5% of 1,148 vs 58.0% of 1,300).

First-attempt pass

60.1%

of 2,450 first tests (2025)

First tests

2,450

test year 2025

Failed first attempts

977

failed first-attempt tests

Most common fail

18.2%

Position lamp (front)

MOT pass rates

First-attempt and official-style rates among class 4 first tests of the year.

First-attempt pass

60.1%

of 2,450 first tests (2025)

Official-style pass

66.8%

incl. same-day PRS fixes

First tests

2,450

class 4 · first MOT of the year

Typical age 13.0 yrs · median mileage 104,648 mi

vs 2024: -0.1 pp first-attempt

Note:

  • Class 4 cars · first MOT of the year per vehicle · P/PRS/F outcomes (2025 data).
  • PRS (fixed at the station the same day) counts as a fail in the first-attempt rate.
  • Raw outcomes for this cohort — not adjusted for age, mileage, or peer mix.
  • MOT doesn't test engine or gearbox internals.

Common faults

Failure patterns that show up more often on this registration year than on similar cars.

These MOT failure patterns show up more often on this registration year than on similar cars of the same class, age, and mileage.

Shares below are measured across the 977 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.

Standout: Ball joint dust cover (front) — 11.6% of this year's failed first attempts

Recorded on 113 of those tests. It tops the table on elevation — about 6.8× more often than on similar cars of the same age and mileage. That is what makes it unusual for its class, which is a different question from what is most likely to fail; the buying checklist ranks by that. The full ranked list is in the table below.

Fault pattern Location Failures vs similar cars Share of fails Confidence
Power steering — Operation
Steering > Power steering > Operation
 Any 21 ×23 2.1% Possible
Ball joint dust cover (front)
Suspension > Suspension arms > Ball joint dust cover
 Front 113 ×6.8 11.6% Strong
Suspension arm (rear)
Suspension > Suspension arms > Suspension arm
 Rear 23 ×5.0 2.4% Possible
Service brake performance (front)
Brakes > Brake performance > Service brake performance > Rbt > Service brake performance
 Front 55 ×3.6 5.6% Likely
Service brake performance
Brakes > Brake performance > Service Brake Efficiency (sp) > Rbt (sp) > Service brake performance
 Any 26 ×3.5 2.7% Possible
Rigid brake pipes (front)
Brakes > Rigid brake pipes
 Front 24 ×3.2 2.5% Possible
Rbt (sp)
Brakes > Brake performance > Parking brake efficiency (sp) > Rbt (sp)
 Any 170 ×3.1 17.4% Likely
Service brake imbalance (rear)
Brakes > Brake performance > Service Brake Efficiency (sp) > Rbt (sp) > Service brake imbalance
 Rear 22 ×3.0 2.3% Possible
Wheel bearings (front)
Suspension > Wheel bearings
 Front 28 ×2.5 2.9% Possible
Service brake performance (rear)
Brakes > Brake performance > Service brake performance > Rbt > Service brake performance
 Rear 48 ×2.2 4.9% Possible

Only patterns that clear minimum sample and elevation thresholds are shown (at least 20 failures and about 2.0× more often than similar cars).

Note: Rates and comparisons are among first-attempt failed tests, not all MOTs. Patterns come from MOT defect codes — not manufacturer service bulletins, recalls, or a diagnosis of any individual car. Failures and advisories are listed separately.

Wear patterns

Usage and mileage effects that often track road use rather than model design.

These patterns look like wear or usage effects rather than model-specific design faults. Tyres, brake friction material, and alignment-related defects often track mileage and road use.

Pattern Location Failures vs similar cars Share of fails Confidence
Brake discs (rear)
Brakes > Mechanical brake components > Brake discs and drums > Brake discs
 Rear 28 ×2.2 2.9% Wear
Note: These patterns are not treated as a model design fault in our common-faults ranking.

Advisories

Notes recorded at the test that appear more often than on similar cars.

Advisory notes recorded on failed first-attempt tests that appear more often than on similar cars.

Advisory pattern Location Notes vs similar cars Share Confidence
Sub-frame mounting prescribed areas (rear)
Suspension > Sub-frames > Sub-frame mounting prescribed areas
 Rear 32 ×9.2 3.3% Elevated
Suspension arm (rear)
Suspension > Suspension arms > Suspension arm
 Rear 155 ×7.8 15.9% Possible
Component mounting prescribed areas (rear)
Suspension > Component mounting prescribed areas
 Rear 41 ×5.7 4.2% Elevated
Sub-frame (rear)
Suspension > Sub-frames > Sub-frame
 Rear 213 ×5.0 21.8% Elevated
Headlamp (front)
Lamps, reflectors and electrical equipment > Headlamps > Headlamp
 Front 36 ×5.0 3.7% Elevated
Suspension arm (front)
Suspension > Suspension arms > Suspension arm
 Front 56 ×4.6 5.7% Elevated
Rigid brake pipes (front)
Brakes > Rigid brake pipes
 Front 86 ×3.6 8.8% Possible
Sub-frame (front)
Suspension > Sub-frames > Sub-frame
 Front 72 ×2.8 7.4% Elevated
Note: Advisories are not a fail rate — they flag issues noted at the test, often before they become failures.

If you are buying one

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

On this year, prefer the petrol. The diesel cars passed first time 4.5 pp less often, on 1,300 tests.

What to check on a 2012 6

The items that failed 2012 6 most often, as a share of the year's failed first attempts. This is what goes wrong, not what is unusual — the table further up the page covers that.

  • Position lamp (front) — recorded on 18.2% of failed first attempts
  • Rbt (sp) — recorded on 17.4% of failed first attempts
  • Ball joint dust cover (front) — recorded on 11.6% of failed first attempts
  • Headlamp aim — recorded on 7.4% of failed first attempts
  • Ball joint (front) — recorded on 7.2% of failed first attempts

Every figure here is a first-attempt MOT rate from DVSA open data for this model line. 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.

Petrol 6 passed first time 4.5 pp more often than diesel ones (62.5% of 1,148 vs 58.0% of 1,300). In 2025, 60.1% of 2,450 first MOTs on the 2012 Mazda 6 passed first time (PRS — items fixed at the station the same day — counted as a fail). The official-style rate including PRS is 66.8%. Among 977 failed first-attempt MOT tests (test year 2025), Ball joint dust cover (front) appears more often than on similar cars (1…
Ranked by how often they were actually recorded, the items that failed 2012 Mazda 6s most often at the first attempt were Position lamp (front) (18.2%), Rbt (sp) (17.4%) and Ball joint dust cover (front) (11.6%) — each as a share of the year's failed first attempts. That is what goes wrong on the car. It is a different question from which patterns are unusual for the class, which the common-faults table answers.
Among failed first-attempt tests we highlight patterns that appear more often than on similar cars. Top example: Ball joint dust cover (front) (11.6% of those tests; 113 observed failures; about 6.8× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
Ball joint dust cover (front) shows up more often than on similar cars (11.6% of those tests; 113 observed failures; about 6.8× 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 check point, not a manufacturer service bulletin.
Common MOT problem areas for the 2012 Mazda 6 include Ball joint dust cover (front), Power steering — Operation, Suspension arm (rear). These patterns show up more often than on similar cars after we filter out sparse noise — not a full list of every possible fault on an 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 6 (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.
  • We never invent pass rates, star scores, or ranks when those data marts are missing.

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

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