Model Reports 4 min read Updated 18 Oct 2026

Kia Rio 2008: reliability & common MOT faults

In 2025, 51 in every 100 first MOTs on a 2008 Kia Rio were passes. Most common reason for a fail: Track rod end (front).

Summary

The 2008 Kia Rio follows the pattern of the model years either side.

At a glance

How 1,598 first tests went in 2025.

Passed first time
51 in every 100
Did not pass first time
49 in every 100785 failed first-attempt tests
The typical car
17 yearsabout 88,912 miles
First tests counted
1,598

What failed most often

  1. Track rod end (front)18 in every 100 failed tests
  2. Individual sidelight or tail light (front)18 in every 100 failed tests
  3. Suspension arm ball joint (front)12 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 2008 Kia Rio 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.

Suspension

Two faults. The strongest is the suspension sub-frame (front): 6.8 times as often as on similar cars.

Figures below are measured across the 784 of 785 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.

Suspension sub-frame (front)

Failed on 35 first tests6.8 times as often as similar carsLikely evidence

What it means

A suspension sub-frame insecurely attached to the chassis or axle is Major, and Dangerous when it is insecure and impairing directional stability. A sub-frame that is missing, likely to become detached, fractured or likely to fail is also Dangerous. Excessive damage or corrosion that seriously weakens it is Major.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 110 first tests, 3.6 times as often as on similar cars.

Suspension arm ball joint (front)

Failed on 91 first tests2.1 times as often as similar carsPossible 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.

Brakes

Two faults. The strongest is the rigid brake pipes: 5.0 times as often as on similar cars.

Rigid brake pipes

Failed on 22 first tests5.0 times as often as similar carsPossible evidence

What it means

Chafing, corrosion or damage to a rigid brake pipe justifies rejection once its wall thickness is reduced by a set amount, although DVSA accepts this is not easy to determine. If a tester is not sure, the benefit of the doubt applies. A leaking pipe or connection is graded Dangerous on a hydraulic system and Major on an air system.

Brake performance (roller test, front)

Failed on 33 first tests2.2 times as often as similar carsPossible evidence

What it means

A wheel with no recorded braking effort on the roller test is graded Dangerous. Inadequate effort, a brake grabbing severely, abnormal lag and excessive fluctuation in effort are each Major. So is significant brake effort recorded with no brake applied, which indicates a binding brake.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 48 first tests, 3.0 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.

Steering

One fault: track rod end (front), 4.6 times as often as on similar cars.

Track rod end (front)

Failed on 141 first tests4.6 times as often as similar carsLikely evidence

What it means

A steering ball joint with excessive wear or free play is Major, and one worn to the extent there is a serious risk of detachment is graded Dangerous. A dust cover that is damaged but still keeps dirt out is Minor, and one missing or no longer keeping dirt out is Major. Testers must tell wear from a joint's built-in clearance or spring loading.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 36 first tests, 3.6 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.

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.

Power steering pipes and hoses

Noted on 36 first tests11 times as often as similar carsElevated evidence

Brake performance (roller test, rear)

Noted on 45 first tests2.2 times as often as similar carsElevated evidence

Suspension arm pins and bushes (front)

Noted on 140 first tests2.1 times as often as similar carsElevated evidence

Suspension arm (front)

Noted on 32 first tests2.1 times as often as similar carsElevated evidence

Number plates (front)

Noted on 59 first tests2.0 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
51in 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
40in every 100
Did not pass, and were not fixed at the test station.

First-attempt pass 50.9% of 1,598 first tests (2025): only cars that passed first time count. Official-style pass 60.1%: cars fixed at the test station also count as a pass. The 9 fixed and the 40 not fixed make the 49 in every 100 that did not pass first time.

Petrol and diesel

First testsPassed first time, as tested
Petrol1,02851
Diesel57050

Figures are in every 100 first tests.

Same model, other years

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

4060801002005200820152020Older carsNewer cars
40608010020082020Newer 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, 49 in every 100 passed first time.

YearPassed first timeFirst tests
200548 in every 100347
200651 in every 100697
200754 in every 100889
2008 This car51 in every 1001,598
200954 in every 1004,030
201055 in every 1005,250
201154 in every 1006,114
201259 in every 1008,171
201361 in every 1009,193
201466 in every 10010,368
201574 in every 10010,904
201676 in every 1008,528
201781 in every 1007,787
201885 in every 1005,571
201984 in every 1004,705
202085 in every 1003,285
202187 in every 1003,559
202291 in every 1004,410

FAQs

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

The 2008 Kia Rio follows the pattern of the model years either side. Its main cause of failure was Track rod end (front), about 18 in every 100 failed tests. In 2025, 50.9% of 1,598 first MOTs on the 2008 Kia Rio passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 60.1%. Among 785 failed first-attempt MOT tests (test year 2025), Suspension sub-frame (front) appears more often than on similar cars (4.5% of those tests; 35 observed failures; about 6.8× 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 2008 Kia Rio at the first attempt were Track rod end (front) (18.0%), Individual sidelight or tail light (front) (17.9%) and Suspension arm ball joint (front) (11.6%), 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: Suspension sub-frame (front) (4.5% of those tests; 35 observed failures; about 6.8× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
Suspension sub-frame (front) shows up more often than on similar cars (4.5% of those tests; 35 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 checkpoint, not a manufacturer service bulletin.
Common MOT problem areas for the 2008 Kia Rio include Suspension sub-frame (front), Rigid brake pipes, Track rod end (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 2008 Kia Rio (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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