Model Reports 4 min read Updated 18 Oct 2026

Suzuki Alto 2015: reliability & common MOT faults

In 2025, 69 in every 100 first MOTs on a 2015 Suzuki Alto were passes. Most common reason for a fail: Brake light.

Summary

The 2015 Suzuki Alto follows the pattern of the model years either side.

At a glance

How 1,720 first tests went in 2025.

Passed first time
69 in every 100
Did not pass first time
31 in every 100539 failed first-attempt tests
The typical car
10 yearsabout 48,534 miles
First tests counted
1,720

What failed most often

  1. Brake light14 in every 100 failed tests
  2. Individual sidelight or tail light (front)12 in every 100 failed tests
  3. Suspension arm pins and bushes (front)9 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 2015 Suzuki Alto vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Lamps and electrical

Three faults. The strongest is the horn: 11 times as often as on similar cars.

Figures below are measured across the 539 failed first attempts in 2025 that had a mileage recorded, which allows a like-for-like comparison.

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.

Horn

Failed on 43 first tests11 times as often as similar carsLikely evidence

What it means

A horn that does not work, or is likely to be confused with an emergency vehicle siren, is graded Major. Gongs, bells, sirens and anything with more than one tone, which includes a horn that alternates between its notes, are not allowed, except a gong, bell or siren on vehicles first used before a set date. Sound defects are Minor for named cases such as a bell or harsh sound, and Major under a general row.

Brake light (rear)

Failed on 74 first tests4.4 times as often as similar carsLikely evidence

What it means

All stop lamps missing or not working is graded Dangerous, and so is a stop lamp that stays on when the brakes are released. A stop lamp that is missing or not working is Major. On some vehicles with LED rear lamps, part of the stop lamp can go out when the rear fog lamp is lit, which is not regarded as a defect.

Individual sidelight or tail light (front)

Failed on 62 first tests3.3 times as often as similar carsLikely evidence

What it means

A position lamp showing red light to the front or white light to the rear is Major. Rear lamps must show a steady red light, and front ones can show white, predominantly white with a blue tinge, or yellow if combined in a yellow headlamp. With a multiple light source, up to half not working is Minor and more than half is Major.

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

Suspension

One fault: suspension arm pins and bushes (front), 2.2 times as often as on similar cars.

Suspension arm pins and bushes (front)

Failed on 51 first tests2.2 times as often as similar carsPossible evidence

What it means

Pins and bushes on suspension arms fail as Major when they are excessively worn. They are graded Dangerous when likely to become detached. DVSA uses the same wording for a suspension joint.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 104 first tests, 2.9 times as often as on similar cars.

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

Visibility

One fault: windscreen wipers (front), 2.0 times as often as on similar cars.

Windscreen wipers (front)

Failed on 41 first tests2.0 times as often as similar carsPossible evidence

What it means

Only a clearly damaged or worn windscreen wiper needs to be rejected. A wiper that is missing or not working is graded Major, and so is a blade that is missing or obviously not clearing the windscreen. A defective blade is graded Minor.

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.

Coil spring (front)

Noted on 36 first tests8.0 times as often as similar carsElevated evidence

Rigid brake pipes (front)

Noted on 34 first tests4.3 times as often as similar carsElevated evidence

Rigid brake pipes (rear)

Noted on 30 first tests3.2 times as often as similar carsElevated evidence

Coil spring (rear)

Noted on 37 first tests2.2 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
69in every 100
Passed on the first test.
Fixed at the station
9in every 100
Failed, then fixed at the test station the same day.
Failed
22in every 100
Did not pass, and were not fixed at the test station.

First-attempt pass 68.7% of 1,720 first tests (2025): only cars that passed first time count. Official-style pass 77.5%: cars fixed at the test station also count as a pass. The 9 fixed and the 22 not fixed make the 31 in every 100 that did not pass first time.

Same model, other years

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

4060801002009201020112012201320142015Older cars
40608010020102015Older 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, 71 in every 100 passed first time.

YearPassed first timeFirst tests
200961 in every 1004,538
201060 in every 1003,946
201163 in every 1004,080
201265 in every 1004,255
201366 in every 10011,003
201468 in every 10012,132
2015 This car69 in every 1001,720

FAQs

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

The 2015 Suzuki Alto follows the pattern of the model years either side. Its main cause of failure was Brake light, about 14 in every 100 failed tests. In 2025, 68.7% of 1,720 first MOTs on the 2015 Suzuki Alto passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 77.5%. Among 539 failed first-attempt MOT tests (test year 2025), Horn appears more often than on similar cars (8.0% of those tests; 43 observed failures; about 11× 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 2015 Suzuki Alto at the first attempt were Brake light (13.7%), Individual sidelight or tail light (front) (11.5%) and Suspension arm pins and bushes (front) (9.5%), 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: Horn (8.0% of those tests; 43 observed failures; about 11× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
Horn shows up more often than on similar cars (8.0% of those tests; 43 observed failures; about 11× 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 2015 Suzuki Alto include Horn, Brake light (rear), Individual sidelight or tail light (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 2015 Suzuki Alto (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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