Generations
Mk7 — Seventh Generation
2008–2019
1.0 EcoBoost, 1.0 EcoBoost 100PS, 1.25 Duratec, 1.4 Duratec, 1.6 Duratec, 2.0 ST
Mk8 — Eighth Generation
2017–2023
1.0 EcoBoost, 1.1 Ti-VCT, 1.5 EcoBoost, 1.5 TDCi
Mk6 — Sixth Generation
2008–2017
1.0 EcoBoost, 1.25 Duratec, 1.4 Duratec, 1.6 Duratec, 1.4 TDCi, 1.5 TDCi
Top issues to watch for
The most serious Ford Fiesta problems ranked by severity. We track 41 known issues — here are the ones you need to know about first.
1.6 EcoBoost ST models built between 2 June 2010 and 20 December 2014 suffer from cylinder head cracking that allows engine oil to leak onto the hot exhaust manifold, creating a significant fire risk. The crack typically occurs between the oil gallery and exhaust port, causing oil to seep externally rather than into the cooling system. Ford issued TSB 14B13 acknowledging this safety-critical defect.
What happens if ignoredOil leaking onto the hot exhaust manifold can ignite, causing an engine bay fire. This represents a serious safety risk to occupants and other road users. Even minor oil seepage should be treated as dangerous. Cylinder head replacement typically costs £2,500-£4,000 including gaskets and labour.
Independent garage
£1,500–£2,500
14B13
Early production 1.5 EcoBoost engines suffer premature head gasket failure due to inadequate cylinder head bolt torque specification and thermal cycling stress. The three-cylinder engine runs hotter and with higher specific output than previous Ford engines, causing head gasket material degradation and coolant loss into the combustion chambers. This issue predominantly affects 2017-2019 production cars and can lead to complete engine failure if coolant loss causes overheating.
What happens if ignoredHead gasket failure allows coolant into cylinders causing potential hydrostatic lock and connecting rod damage. Coolant loss can cause rapid overheating and complete engine seizure. Repair requires cylinder head removal and resurfacing. Total repair costs range £1,500-£3,000 depending on associated damage. The car should not be driven if head gasket failure is confirmed.
Independent garage
£1,200–£2,000
Early 1.0 EcoBoost engines (2012-2016) used nylon coolant pipes that become brittle and fail suddenly, causing complete coolant loss and immediate overheating. The failure provides no warning - the pipe splits and dumps the entire cooling system contents within seconds. This is particularly critical on EcoBoost engines which run high compression ratios and generate significant heat. Later production models use improved rubber hoses.
What happens if ignoredSudden coolant loss causes immediate engine overheating and potential cylinder head warping, head gasket failure, or complete engine destruction. Repair costs range from £1,500 for head gasket replacement to £5,000 for complete engine rebuild. The car becomes undriveable once overheating occurs.
Independent garage
£200–£2,500
The dual-clutch Powershift automatic transmission fitted to 2011-2015 Fiestas has a catastrophic failure rate due to premature clutch wear and control module faults. The transmission shudders, hesitates, and can lose drive entirely without warning. Ford faced multiple class-action lawsuits in the US over this transmission. UK specialists universally recommend avoiding Powershift-equipped Fiestas as the repair costs often exceed the vehicle's value.
What happens if ignoredComplete transmission failure leaves the vehicle undriveable. Repair involves replacing both clutch packs and often the control module, typically costing £2,500-£4,000. Many specialists refuse to repair Powershift transmissions due to high failure rates even after rebuild. Vehicle may lose drive suddenly in traffic creating safety hazards.
Independent garage
£1,500–£3,000
37 more known issues tracked
Including further major faults, wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.
Check a Ford Fiesta →
MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Ford Fiesta fails at a significantly higher rate than the average car.
Emissions failure
Exhaust & Emissions · 20-40k miles
MOT failure rate: 489x the fleet average
Sample: 258 tests
ABS fault
Suspension · 0-20k miles
MOT failure rate: 129x the fleet average
Sample: 962 tests
Light unit fault
Lights & Electrics · 40-60k miles
MOT failure rate: 119x the fleet average
Sample: 283 tests
Brake hoses perished or damaged
Brakes · 20-40k miles
MOT failure rate: 110x the fleet average
Sample: 8,893 tests
Braking effort inadequate at a wheel
Brakes · 20-40k miles
MOT failure rate: 96x the fleet average
Sample: 8,233 tests
Lamp emitted colour, position or intensity not ...
Lights & Electrics · 80-100k miles
MOT failure rate: 94x the fleet average
Sample: 69,904 tests
Technical service bulletins & recalls
Official manufacturer notices issued to dealerships. If a car hasn't had recall work done, it needs doing — check with the dealer network.
14B13
1.6L EcoBoost cylinder head cracking - oil leak fire risk
Cylinder head cracking allows oil to leak onto exhaust manifold creating fire risk. Affects vehicles built 2 June 2010 to 20 December 2014. Check for recall completion and oil staining around cylinder head.
Mk7 · Duratec HE · Issued: 2014-12
21B03
EcoBoost Wet Belt Oil Dilution and Timing System Service
Ford acknowledged wet belt degradation causing oil contamination and potential catastrophic engine failure on 1.0 EcoBoost engines. TSB covers inspection procedure and replacement criteria. Buyers should verify wet belt condition and any previous replacement work.
Mk8 · M1DA · Issued: 2021-02
Buying a Ford Fiesta?
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Ford Fiesta reliability FAQs
What are the most common problems with the Ford Fiesta?
The Ford Fiesta has 41 known issues across 4 severity levels. The most serious are: Cylinder head cracking (fire risk) (Mk7), Head gasket failure (Mk8), Coolant system failure (nylon pipe) (Mk7).
Is the Ford Fiesta reliable?
The Ford Fiesta has 8 dangerous and 16 major known issues. This is a higher number than average — careful pre-purchase inspection is essential.
How much does it cost to fix Ford Fiesta problems?
Repair costs range widely. The most significant issue (Cylinder head cracking (fire risk) (Mk7)) costs £1,500–£2,500 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.
Which Ford Fiesta generation is most reliable?
The Mk6 (2008–2017) has the fewest dangerous issues (1). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.