Ford Fiesta 2003: reliability & common MOT faults
Elevated MOT failure patterns for the 2003 Ford Fiesta include Service brake imbalance (rear) (~4.3× peers) and Headlamp levelling device (~3.1× peers). Based on UK DVSA open data for test year 2025 (5,199 failed first-attempt tests), compared with similar age and mileage peers. Available test years: 2024, 2025.
Common faults
These are MOT failure patterns that show up more often on this registration year than on similar cars of the same class, age band, and mileage in the same test year (leave-one-out peer comparison; whole model family excluded).
Statistical patterns from MOT defect codes — not manufacturer TSBs, recalls, or a diagnosis of any individual car. Fail and advisory patterns are kept separate.
Based on 5,199 failed first-attempt tests in test year 2025.
Service brake imbalance (rear)
This failure pattern appears about 4.3× more often than on similar peer cars — recorded on 498 failed first-attempt tests; 9.6% of failed tests for this model year.
Rear · 498 failures · ×4.3 vs similar cars · 9.6% of failed first tests · Likely common fault pattern
Headlamp levelling device
This failure pattern appears about 3.1× more often than on similar peer cars — recorded on 122 failed first-attempt tests; 2.3% of failed tests for this model year.
Any · 122 failures · ×3.1 vs similar cars · 2.3% of failed first tests · Likely common fault pattern
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 |
|---|---|---|---|---|---|---|
| 1 |
Service brake imbalance (rear)
Brakes > Brake performance > Service Brake Efficiency (sp) > Rbt (sp) > Service brake imbalance
|
Rear | 498 | ×4.3 | 9.6% | Likely common fault pattern |
| 2 |
Headlamp levelling device
Lamps, reflectors and electrical equipment > Headlamps > Headlamp levelling device
|
Any | 122 | ×3.1 | 2.3% | Likely common fault pattern |
| 3 |
Ball joint dust cover (front)
Suspension > Suspension arms > Ball joint dust cover
|
Front | 381 | ×3.1 | 7.3% | Likely common fault pattern |
| 4 |
Seat belts — Condition (rear)
Seat belts and supplementary restraint systems > Seat belts > Condition
|
Rear | 125 | ×3.0 | 2.4% | Possible elevated fault |
| 5 |
Rigid brake pipes (front)
Brakes > Rigid brake pipes
|
Front | 342 | ×2.9 | 6.6% | Possible elevated fault |
| 6 |
Wheel bearings (rear)
Suspension > Wheel bearings
|
Rear | 196 | ×2.6 | 3.8% | Possible elevated fault |
| 7 |
Rigid brake pipes (rear)
Brakes > Rigid brake pipes
|
Rear | 428 | ×2.2 | 8.2% | Possible elevated fault |
| 8 |
Service brake performance
Brakes > Brake performance > Service Brake Efficiency (sp) > Rbt (sp) > Service brake performance
|
Any | 195 | ×2.1 | 3.8% | Possible elevated fault |
| 9 |
Rigid brake pipes
Brakes > Rigid brake pipes
|
Any | 115 | ×2.1 | 2.2% | Possible elevated fault |
| 10 |
Stop lamp
Lamps, reflectors and electrical equipment > Stop lamp
|
Any | 621 | ×2.1 | 11.9% | Possible elevated fault |
Only patterns that clear minimum sample and elevation thresholds are shown (at least 20 failures and 2.0× peer lift).
Wear patterns
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. They are not treated as a model design fault in our common-faults ranking.
| # | Pattern | Location | Failures | vs similar cars | Share of fails | Confidence |
|---|---|---|---|---|---|---|
| 1 |
Tyres — Size/type (front)
Tyres > Size/type
|
Front | 24 | ×2.3 | 0.5% | Wear / usage pattern — not treated as a model design fault |
| 2 |
Tyres — Size/type (rear)
Tyres > Size/type
|
Rear | 25 | ×2.2 | 0.5% | Wear / usage pattern — not treated as a model design fault |
Advisories
Advisory items recorded on failed first-attempt tests that appear elevated versus peers. Advisories are not a fail rate — they flag issues noted at the test, often before they become failures.
| # | Advisory pattern | Location | Notes | vs similar cars | Share | Confidence |
|---|---|---|---|---|---|---|
| 1 |
Road Wheels — Condition (rear)
Road Wheels > Condition
|
Rear | 155 | ×5.0 | 3.0% | Elevated vs peers |
| 2 |
Road Wheels — Condition (front)
Road Wheels > Condition
|
Front | 238 | ×4.9 | 4.6% | Possible elevated fault |
| 3 |
Swivel pins and bushes (rear)
Suspension > Axles > Swivel pins and bushes
|
Rear | 194 | ×3.6 | 3.7% | Likely common fault pattern |
| 4 |
Wheel bearings (rear)
Suspension > Wheel bearings
|
Rear | 195 | ×3.2 | 3.8% | Possible elevated fault |
| 5 |
Pins and bushes (rear)
Suspension > Other suspension component > Pins and bushes
|
Rear | 25 | ×2.7 | 0.5% | Elevated vs peers |
| 6 |
Stop lamp
Lamps, reflectors and electrical equipment > Stop lamp
|
Any | 121 | ×2.6 | 2.3% | Possible elevated fault |
| 7 |
Transmission oil leaks
Noise, emissions and leaks > Fluid leaks > Transmission oil leaks
|
Any | 209 | ×2.4 | 4.0% | Elevated vs peers |
| 8 |
Transmission oil leaks (front)
Noise, emissions and leaks > Fluid leaks > Transmission oil leaks
|
Front | 41 | ×2.4 | 0.8% | Elevated vs peers |
FAQs
About this data
Universe. UK class 4 cars only; normal MOT tests (not retests); results pass, PRS, or fail; one first test per vehicle per calendar year.
PRS policy. PRS means the vehicle 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.
Peer baseline. We compare this model year with other class 4 cars of similar age and mileage in the same test year, excluding the whole model family so the car is not compared with itself (leave-one-out peer baseline).
Data years. Test years covered: 2024, 2025.
Limitations.
- MOT tests do not cover engine internals, gearboxes, or many electronic modules — so this is not a full reliability score.
- Common faults are inferred from MOT defect statistics, not manufacturer TSBs or recalls.
- Matching on age and mileage reduces but does not remove every usage or maintenance difference between cars.
- Pass rates and star scores appear only when those data marts are available; this page never invents them.
Display rules config: 1
Contains public sector information licensed under the Open Government Licence v3.0.