Ford Fiesta ST Line Turbo (2018)
2018 Ford Fiesta ST Line Turbo
CarHunch analysed 561 real MOT records for the 2018 Ford Fiesta ST Line Turbo. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2018 Fiesta ST-Line Turbo is a significant reliability concern at MOT—only 51.2% pass first time against the UK average of 80%, and the fuel breakdown reveals a stark problem: petrol versions are nearly failing outright at 0.3% pass rate while the "Other" fuel category (likely mild hybrid or alternative powertrain variants) achieves 95.5%. No dangerous defects have been recorded in this cohort, which is a small mercy, but the petrol model's catastrophic first-time pass rate makes it a risky buy without detailed pre-purchase inspection. The median mileage of 43,074 miles is reasonable for a 2018, yet these cars are still accumulating failures—averaging 0.09 failures per vehicle—suggesting mechanical or emissions issues common to the petrol turbo engine rather than age-related wear. If you're considering a petrol ST-Line Turbo, get a full diagnostic on the turbocharger, fuel system, and emissions equipment before committing, and prioritise the non-petrol variants or look at a different model entirely.
What to check before buying a 2018 Ford Fiesta ST Line Turbo
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Ford Fiesta ST Line Turbo
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Other (53%) | 300 | 95.5% | 0.16 |
| Petrol (47%) | 261 | 0.3% | 0 |
Mileage Distribution
Most 2018 Ford Fiesta ST Line Turbo vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2018 Ford Fiesta ST Line Turbo vehicles fall between 32,078 and 53,761 miles.
2018 Ford Fiesta ST Line Turbo — Still on the Road
152 vehicles still getting MOTs in 2025 — 62% of the peak remain.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2022–2025.
MOT History Averages
Found a specific Ford Fiesta ST Line Turbo?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.