Model Reports 4 min read Updated 18 Oct 2026

Toyota Avensis 2003: reliability & common MOT faults

In 2025, 55 in every 100 first MOTs on a 2003 Toyota Avensis were passes. Most common reason for a fail: Petrol engine warning light.

Summary

The 2003 Toyota Avensis follows the pattern of the model years either side.

At a glance

How 1,505 first tests went in 2025.

Passed first time
55 in every 100
Did not pass first time
45 in every 100670 failed first-attempt tests
The typical car
22 yearsabout 109,180 miles
First tests counted
1,505

What failed most often

  1. Petrol engine warning light16 in every 100 failed tests
  2. Individual sidelight or tail light (front)15 in every 100 failed tests
  3. Brake light9 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 Toyota Avensis 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.

Noise, emissions and leaks

One fault: petrol engine warning light, 2.5 times as often as on similar cars.

Figures below are measured across the 670 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.

Petrol engine warning light

Failed on 104 first tests2.5 times as often as similar carsPossible evidence

What it means

The malfunction indicator lamp (MIL) on a petrol engine is a Major failure when it is illuminated indicating a malfunction. The detail line DVSA gives for the same row also names an inoperative lamp. The test covers only certain petrol vehicles, depending on their age, size and fuel type.

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

Lamps and electrical

One fault: individual sidelight or tail light (rear), 2.0 times as often as on similar cars.

Individual sidelight or tail light (rear)

Failed on 50 first tests2.0 times as often as similar carsPossible 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.

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.

Suspension arm (front)

Noted on 56 first tests3.9 times as often as similar carsElevated evidence

Suspension arm (rear)

Noted on 44 first tests2.8 times as often as similar carsElevated evidence

Brake pads (rear)

Noted on 45 first tests2.4 times as often as similar carsWear pattern

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
12in every 100
Failed, then fixed at the test station the same day.
Failed
33in every 100
Did not pass, and were not fixed at the test station.

First-attempt pass 55.5% of 1,505 first tests (2025): only cars that passed first time count. Official-style pass 67.4%: cars fixed at the test station also count as a pass. The 12 fixed and the 33 not fixed make the 45 in every 100 that did not pass first time.

Same model, other years

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

4060801002000200320102015Older carsNewer cars
406080100200020032010Newer 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, 57 in every 100 passed first time.

YearPassed first timeFirst tests
200060 in every 100338
200159 in every 100467
200260 in every 100661
2003 This car55 in every 1001,505
200458 in every 1002,014
200557 in every 1002,786
200657 in every 1003,614
200758 in every 1004,056
200857 in every 1004,274
200962 in every 1004,514
201064 in every 1004,842
201165 in every 1003,942
201269 in every 1004,291
201370 in every 1002,810
201473 in every 1002,681
201576 in every 1002,819
201680 in every 1003,203
201781 in every 1002,212
201881 in every 1001,022

FAQs

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

The 2003 Toyota Avensis follows the pattern of the model years either side. Its main cause of failure was Petrol engine warning light, about 16 in every 100 failed tests. In 2025, 55.5% of 1,505 first MOTs on the 2003 Toyota Avensis passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 67.4%. Among 670 failed first-attempt MOT tests (test year 2025), Petrol engine warning light appears more often than on similar cars (15.5% of those tests; 104 observed failures; about 2.5× 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 Toyota Avensis at the first attempt were Petrol engine warning light (15.5%), Individual sidelight or tail light (front) (14.6%) and Brake light (8.8%), 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: Petrol engine warning light (15.5% of those tests; 104 observed failures; about 2.5× more often than similar cars). These are statistical signals, not a diagnosis of any individual car.
Petrol engine warning light shows up more often than on similar cars (15.5% of those tests; 104 observed failures; about 2.5× 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 Toyota Avensis include Petrol engine warning light, Individual sidelight or tail light (rear). 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 Toyota Avensis (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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