Model Reports 5 min read Updated 18 Oct 2026

Ford Fiesta 2003: reliability & common MOT faults

In 2025, 55 in every 100 first MOTs on a 2003 Ford Fiesta were passes. Most common reason for a fail: Brake light.

Summary

The 2003 Ford Fiesta follows the pattern of the model years either side.

At a glance

How 11,632 first tests went in 2025.

Passed first time
55 in every 100
Did not pass first time
45 in every 1005,263 failed first-attempt tests
The typical car
22 yearsabout 91,154 miles
First tests counted
11,632

What failed most often

  1. Brake light12 in every 100 failed tests
  2. Petrol emissions (with catalyst)10 in every 100 failed tests
  3. Brake imbalance across an axle (roller test, efficiency check, rear)10 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 2003 Ford Fiesta vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. A wear pattern follows age and use more than the way the car was built. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Brakes

Four faults. The strongest is the brake imbalance across an axle (roller test, efficiency check, rear): 4.3 times as often as on similar cars.

Figures below are measured across the 5,199 of 5,263 failed first attempts (98.8%) 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.

Brake imbalance across an axle (roller test, efficiency check, rear)

Failed on 498 first tests4.3 times as often as similar carsLikely evidence

What it means

A wheel giving less than a set share of the maximum effort from the other wheel on the same axle is Major. On a steered axle, less than half is graded Dangerous. Testers disregard an imbalance if the lower effort is the result of a locked wheel, or if the higher effort from a wheel is at or below a low set figure.

Rigid brake pipes (front)

Failed on 342 first tests2.9 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.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 839 first tests, 2.2 times as often as on similar cars.

Rigid brake pipes (rear)

Failed on 428 first tests2.2 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 efficiency below minimum (roller test)

Failed on 195 first tests2.1 times as often as similar carsPossible evidence

What it means

Service brake efficiency below the minimum requirement is Major, and efficiency less than half of the required value is graded Dangerous. On a roller brake tester, if more than half of the wheels of a brake system lock, the efficiency requirement for that system counts as met.

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

Lamps and electrical

Two faults. The strongest is the headlight levelling device: 3.1 times as often as on similar cars.

Headlight levelling device

Failed on 122 first tests3.1 times as often as similar carsLikely evidence

What it means

A headlamp levelling device that is inoperative is graded Major, and so is a manual levelling device that cannot be operated from the driver's seat. Vehicles with high intensity discharge or LED dipped beam headlamps may have a self-levelling system, and if fitted it must work. Where it is not easy to tell, testers give the benefit of the doubt, and motor caravans are not checked.

Brake light

Failed on 621 first tests2.1 times as often as similar carsPossible 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.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 121 first tests, 2.6 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.

Suspension

Two faults. The strongest is the suspension arm ball joint dust cover (front): 3.1 times as often as on similar cars.

Suspension arm ball joint dust cover (front)

Failed on 381 first tests3.1 times as often as similar carsLikely evidence

What it means

Whether a suspension arm ball joint dust cover still keeps dirt out decides its grade. Severely deteriorated is Minor, while missing, or no longer preventing the ingress of dirt, is Major.

Wheel bearings (rear)

Failed on 196 first tests2.6 times as often as similar carsPossible evidence

What it means

Excessive play in a wheel bearing, or a bearing that is excessively rough, is Major. Play so excessive that the bearing is likely to break up or directional control is impaired is Dangerous, and so is a bearing so rough that it is likely to overheat or break up.

Also noted as an advisory

Testers also noted it as an advisory, worn but not yet failing, on 195 first tests, 3.2 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.

Seat belts and restraints

One fault: seat belt condition (rear), 3.0 times as often as on similar cars.

Seat belt condition (rear)

Failed on 125 first tests3.0 times as often as similar carsPossible evidence

What it means

Any sign of overstretching is a deficiency, and so is a cut anywhere on a child seat belt. On other belts the size of a cut decides it, with a stricter limit at the webbing edge than away from it. Webbing significantly stretched or weakened has rows in both Major and Dangerous grades.

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

Tyres

Two wear patterns. The strongest is the tyre size or type (front): 2.3 times as often as on similar cars.

Tyre size or type (front)

Failed on 24 first tests2.3 times as often as similar carsWear pattern

What it means

Tyres of different sizes or different aspect ratios on the same axle, or on twin wheels, are graded Major, as are tyres of different structure on the same axle, such as radial-ply and cross-ply. Steel and fabric radial-ply count as the same structure. The manual treats a standard car tyre and one of a single stated lower aspect ratio as almost identical in size, so that pair is allowed in any mix.

Tyre size or type (rear)

Failed on 25 first tests2.2 times as often as similar carsWear pattern

What it means

Tyres of different sizes or different aspect ratios on the same axle, or on twin wheels, are graded Major, as are tyres of different structure on the same axle, such as radial-ply and cross-ply. Steel and fabric radial-ply count as the same structure. The manual treats a standard car tyre and one of a single stated lower aspect ratio as almost identical in size, so that pair is allowed in any mix.

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.

Wheel condition (rear)

Noted on 155 first tests5.0 times as often as similar carsElevated evidence

Wheel condition (front)

Noted on 238 first tests4.9 times as often as similar carsPossible evidence

Swivel pins and bushes (rear)

Noted on 194 first tests3.6 times as often as similar carsLikely evidence

Other suspension component pins and bushes (rear)

Noted on 25 first tests2.7 times as often as similar carsElevated evidence

Transmission oil leaks (front)

Noted on 209 first tests2.4 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
55in 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
36in every 100
Did not pass, and were not fixed at the test station.

First-attempt pass 54.8% of 11,632 first tests (2025): only cars that passed first time count. Official-style pass 64.3%: cars fixed at the test station also count as a pass. The 9 fixed and the 36 not fixed make the 45 in every 100 that did not pass first time.

Petrol and diesel

First testsTypical mileagePassed first time, as testedPassed first time, same mileage
Petrol10,65589,032 miles5554
Diesel977120,812 miles5659

Figures are in every 100 first tests. Cars with more miles usually fail more often, so the same-mileage figure gives every fuel the mileage mix of all the cars in this year.

Same model, other years

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

40608010020002003201020152020Older carsNewer cars
4060801002000200320102020Newer 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, 54 in every 100 passed first time.

YearPassed first timeFirst tests
199753 in every 100407
199852 in every 100879
199956 in every 1001,115
200054 in every 1001,109
200155 in every 1001,907
200256 in every 1005,496
2003 This car55 in every 10011,632
200453 in every 10015,586
200553 in every 10019,163
200652 in every 10032,932
200753 in every 10042,015
200852 in every 10046,538
200953 in every 10080,926
201055 in every 10078,060
201157 in every 10077,995
201258 in every 10092,486
201360 in every 100105,711
201462 in every 100115,867
201565 in every 100119,208
201667 in every 100108,889
201774 in every 10086,424
201883 in every 10089,668
201985 in every 10075,408
202086 in every 10048,062
202189 in every 10026,736
202291 in every 10024,525

If you are buying one

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

Mileage matters most on a 2003 Fiesta.

Of 2003 Fiesta vehicles with under 62,000 miles, 66 in every 100 passed their 2025 MOT first time. With 124,000 miles or more, 49 in every 100 did.

Under 62,0002,287 tests
66
62,000–82,0002,289 tests
57
82,000–101,000 Typical car2,366 tests
52
101,000–124,0002,279 tests
49
124,000 and over2,297 tests
49

Petrol or diesel?

Typical mileagePassed first time,
as tested		Passed first time,
same mileage
Petrol89,032 miles5554
Diesel120,812 miles5759

Figures are in every 100 first tests. At the same mileage there is no clear difference between the two.

What to check at your mileage

How often each fault turned up on a failed first test, by the car's mileage. Read it as: what is likely to need looking at on a car like the one in front of you.

Under 62,00082,000–101,000124,000 and over
Brake light3.16.56.1
Petrol emissions (with catalyst)1.54.47.4
Brake imbalance across an axle (roller test, efficiency check, rear)2.94.44.9
Individual sidelight or tail light (front)0.94.17.0
Petrol engine warning light2.23.44.9

Faults per 100 first tests, by the car's mileage at the test.

When a car fails

21in every 100

of failed cars had one item to fix.

57in every 100

of failed cars had three or more items to fix.

9in every 100

of all first tests had a defect the tester marked dangerous (unsafe to drive away).

Every figure here is a first-attempt MOT rate from DVSA open data for this model line, for cars of this model year tested in 2025. Each mileage band holds a fifth of the tests. 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.

The 2003 Ford Fiesta follows the pattern of the model years either side. Its main cause of failure was Brake light, about 12 in every 100 failed tests. In 2025, 54.8% of 11,632 first MOTs on the 2003 Ford Fiesta passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 64.3%. Among 5,263 failed first-attempt MOT tests (test year 2025), Brake imbalance across an axle (roller test, efficiency check, rear) appears more often than on similar cars (9.6% of those tests; 498 observed failures; about 4.3× 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 2003 Ford Fiesta at the first attempt were Brake light (11.9%), Petrol emissions (with catalyst) (10.0%) and Brake imbalance across an axle (roller test, efficiency check, rear) (9.6%), 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: Brake imbalance across an axle (roller test, efficiency check, rear) (9.6% of those tests; 498 observed failures; about 4.3× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
Brake imbalance across an axle (roller test, efficiency check, rear) shows up more often than on similar cars (9.6% of those tests; 498 observed failures; about 4.3× 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 2003 Ford Fiesta include Brake imbalance across an axle (roller test, efficiency check, rear), Headlight levelling device, Suspension arm ball joint dust cover (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 2003 Ford Fiesta (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.

Check any vehicle’s MOT history

Full MOT history, mileage records, and reliability insights for any UK vehicle.

Run a free check