Model Reports 8 min read Updated 11 Sep 2026 DVSA open data · 1,536 tests analysed

Mercedes-Benz X-Class 2019: reliability & common MOT faults

298 first-attempt MOT failures were recorded on the 2019 Mercedes-Benz X-Class in 2025. Figures are among first-attempt failed MOT tests, not among all tests.

First-attempt pass rate 80.6% across 1,536 tests in 2025. Nothing in this year's figures separates it from the X-Class either side — no fuel gap, and no break in the model's own trend.

First-attempt pass

80.6%

of 1,536 first tests (2025)

First tests

1,536

test year 2025

Failed first attempts

298

failed first-attempt tests

MOT pass rates

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

First-attempt pass

80.6%

of 1,536 first tests (2025)

Official-style pass

83.6%

incl. same-day PRS fixes

First tests

1,536

class 4 · first MOT of the year

Typical age 6.0 yrs · median mileage 60,998 mi

vs 2024: +0.9 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 298 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.

Standout: SRS malfunction indicator lamp — 16.4% of this year's failed first attempts

Recorded on 49 of those tests. It tops the table on elevation — about 16× more often than on similar cars of the same age and mileage. The full ranked list is in the table below.

No patterns met the strongest callout thresholds on this page; showing the highest-lift rows that still cleared the display floors.

Fault pattern Location Failures vs similar cars Share of fails Confidence
SRS malfunction indicator lamp
Seat belts and supplementary restraint systems > SRS malfunction indicator lamp
 Any 49 ×16 16.4% Likely
Malfunction indicator lamp
Noise, emissions and leaks > Exhaust emissions > Compression ignition > Malfunction indicator lamp
 Any 42 ×3.4 14.1% Likely

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
Tyre pressure monitoring system
Tyres > Tyre pressure monitoring system
 Any 24 ×3.7 8.1% Wear
Note: These patterns are not treated as a model design fault in our common-faults ranking.

If you are buying one

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

Other X-Class 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
2020 X-Class +5.4 pp better 86.0% 630

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.

Nothing in this year's figures separates it from the X-Class either side — no fuel gap, and no break in the model's own trend. In 2025, 80.6% of 1,536 first MOTs on the 2019 Mercedes-Benz X-Class passed first time (PRS — items fixed at the station the same day — counted as a fail). The official-style rate including PRS is 83.6%. Among 298 failed first-attempt MOT tests (test year 2025), SRS malfunction indicator lam…
Among failed first-attempt tests we highlight patterns that appear more often than on similar cars. Top example: SRS malfunction indicator lamp (16.4% of those tests; 49 observed failures; about 16× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
SRS malfunction indicator lamp shows up more often than on similar cars (16.4% of those tests; 49 observed failures; about 16× 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 2019 Mercedes-Benz X-Class include SRS malfunction indicator lamp, Malfunction indicator lamp. 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.
This page highlights MOT failure patterns for the 2019 Mercedes-Benz X-Class (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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