Model Reports 8 min read Updated 11 Sep 2026 DVSA open data · 30,390 tests analysed

Vauxhall Mokka 2018: reliability & common MOT faults

8,903 first-attempt MOT failures were recorded on the 2018 Vauxhall Mokka in 2025. The items recorded most often on them were Ball joint dust cover (front) and Coil spring (rear). Figures are among first-attempt failed MOT tests, not among all tests.

Petrol Mokkas passed first time 3.2 pp more often than diesel ones (70.8% of 29,074 vs 67.6% of 1,316).

First-attempt pass

70.7%

of 30,390 first tests (2025)

First tests

30,390

test year 2025

Failed first attempts

8,903

failed first-attempt tests

Most common fail

26.1%

Ball joint dust cover (front)

MOT pass rates

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

First-attempt pass

70.7%

of 30,390 first tests (2025)

Official-style pass

75.8%

incl. same-day PRS fixes

First tests

30,390

class 4 · first MOT of the year

Typical age 7.0 yrs · median mileage 45,080 mi

vs 2024: -5.7 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 8,900 of 8,903 failed first attempts that recorded an odometer reading in 2025 — the subset the age-and-mileage comparison can be computed on.

Standout: Ball joint dust cover (front) — 26.1% of this year's failed first attempts

Recorded on 2,321 of those tests. It tops the table on elevation — about 41× more often than on similar cars of the same age and mileage. On this year it is also the commonest failure, so it answers both questions at once. The full ranked list is in the table below.

Fault pattern Location Failures vs similar cars Share of fails Confidence
Ball joint dust cover (front)
Suspension > Suspension arms > Ball joint dust cover
 Front 2,321 ×41 26.1% Strong
Exhaust system (front)
Body, chassis, structure > Exhaust system
 Front 326 ×9.1 3.7% Strong
Position lamp (rear)
Lamps, reflectors and electrical equipment > Position lamps > Position lamp
 Rear 648 ×7.5 7.3% Strong
Coil spring (rear)
Suspension > Springs > Coil springs > Coil spring
 Rear 1,039 ×3.9 11.7% Likely
Coil spring (front)
Suspension > Springs > Coil springs > Coil spring
 Front 935 ×2.9 10.5% Possible
Malfunction indicator lamp
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Malfunction indicator lamp
 Any 621 ×2.6 7.0% Possible
Rbt (sp)
Brakes > Brake performance > Parking brake efficiency (sp) > Rbt (sp)
 Any 341 ×2.5 3.8% 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.

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
Side repeaters (front)
Lamps, reflectors and electrical equipment > Direction indicators > Flashing type > Side repeaters
 Front 76 ×41 0.9% Elevated
Other leaks
Noise, emissions and leaks > Fluid leaks > Other leaks
 Any 37 ×13 0.4% Elevated
Pins and bushes (front)
Suspension > Macpherson strut > Pins and bushes
 Front 227 ×11 2.6% Likely
Exhaust system (front)
Body, chassis, structure > Exhaust system
 Front 530 ×9.1 6.0% Strong
Attachment bracket and mounting (front)
Suspension > Macpherson strut > Attachment bracket and mounting
 Front 20 ×7.0 0.2% Elevated
Pedal
Brakes > Service brake pedal or hand lever > Pedal
 Any 51 ×5.2 0.6% Elevated
Engine oil leaks (front)
Noise, emissions and leaks > Fluid leaks > Engine oil leaks
 Front 714 ×5.0 8.0% Possible
Transmission oil leaks (front)
Noise, emissions and leaks > Fluid leaks > Transmission oil leaks
 Front 120 ×4.8 1.3% 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 3.2 pp less often, on 1,316 tests.

This year also sits 1.3 pp below the midpoint of the 2017 and 2019 cars either side of it — a real break in the model's own run, not the usual year-on-year drift.

Other Mokka years worth knowing about

Newer cars always pass more often, so a plain "best year" list would just rank by age. These are the years that beat or miss the trend their own neighbouring years set — the only age-adjusted signal this data supports.

Year vs the years either side First-attempt pass (rises with newer cars) First tests
2019 Mokka +6.6 pp better 77.3% 21,398
2022 Mokka +2.0 pp better 89.3% 20,977
2021 Mokka -6.1 pp worse 83.2% 12,504
2016 Mokka -2.3 pp worse 62.2% 37,902

What to check on a 2018 Mokka

The items that failed 2018 Mokkas 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.

  • Ball joint dust cover (front) — recorded on 26.1% of failed first attempts
  • Coil spring (rear) — recorded on 11.7% of failed first attempts
  • Brake pads (rear) — recorded on 7.6% of failed first attempts
  • Position lamp (rear) — recorded on 7.3% of failed first attempts
  • Visibility — Wipers (front) — recorded on 7.3% 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 Mokkas passed first time 3.2 pp more often than diesel ones (70.8% of 29,074 vs 67.6% of 1,316). In 2025, 70.7% of 30,390 first MOTs on the 2018 Vauxhall Mokka passed first time (PRS — items fixed at the station the same day — counted as a fail). The official-style rate including PRS is 75.8%. Among 8,903 failed first-attempt MOT tests (test year 2025), Ball joint dust cover (front) appears more often than on…
Ranked by how often they were actually recorded, the items that failed 2018 Vauxhall Mokkas most often at the first attempt were Ball joint dust cover (front) (26.1%), Coil spring (rear) (11.7%) and Brake pads (rear) (7.6%) — 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…
Among failed first-attempt tests we highlight patterns that appear more often than on similar cars. Top example: Ball joint dust cover (front) (26.1% of those tests; 2,321 observed failures; about 41× 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 (26.1% of those tests; 2,321 observed failures; about 41× 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 2018 Vauxhall Mokka include Ball joint dust cover (front), Exhaust system (front), Position lamp (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 2018 Vauxhall Mokka (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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