How much does a Ford Fiesta ST 1.5 EcoBoost engine replacement cost-

A full rebuilt or reconditioned Ford Fiesta ST 1.5 EcoBoost engine typically costs between £2,500 and £4,000, including supply and fit. Rebuilt units include upgraded performance components and a 12-month warranty. Main dealers often charge £6,500+ for the same replacement. Used engines are a budget alternative, starting from around £600.

Does the Ford Fiesta ST 1.5 EcoBoost have the wet belt problem-

The Ford Fiesta ST 1.5 EcoBoost uses a hybrid setup: a timing chain for the camshafts, but a wet belt for the oil pump. Unlike the problematic 1.0 EcoBoost, the ST's cam drive is chain-driven and highly robust. However, the oil pump wet belt can still degrade over time, making preventative replacement at 60,000 miles highly recommended to avoid oil starvation.

Is it worth replacing the engine in a Ford Fiesta ST 1.5 EcoBoost-

Yes, absolutely. The Ford Fiesta ST retains strong market values, typically ranging from £8,000 to £16,000. A full rebuilt engine replacement (£2,500-£4,000) represents a small fraction of the vehicle's total worth. Investing in a warrantied, reconditioned unit preserves the car's performance and resale value far better than a cheap, unverified used engine.

How long does a Ford Fiesta ST 1.5 EcoBoost engine replacement take-

A standard Ford Fiesta ST 1.5 EcoBoost engine swap typically takes 5 to 7 working days. This includes sourcing the correct 200 PS YZJA performance unit, nationwide delivery to your chosen specialist, and physical installation, ECU calibration, fluid top-up, and comprehensive road testing.

What trim levels use the YZJA 1.5 EcoBoost engine-

The YZJA 1.5 EcoBoost engine was fitted exclusively to the performance-oriented trim levels of the Ford Fiesta Mk8 (2018-2023). Compatible trims include ST-2 and ST-3. Standard trims (Zetec, Titanium, ST-Line) utilised the 1.0 EcoBoost or 1.1 Duratec engines.

Ford ST 1.5 EcoBoost SPECIALISTS

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Ford Fiesta ST 1.5 EcoBoost Engine

from£2,500 to £4,000...

Usedfrom £600
Reconditionedfrom £1,600
Common codesYZJA

Ford fiesta-st 1.5 EcoBoost Used Engine — YZJA

Ford fiesta-stUsed Engine — YZJA

Ford fiesta-st 1.5 EcoBoost Reconditioned Engine — YZJA

Ford fiesta-stReconditioned Engine — YZJA

Ford fiesta-st 1.5 EcoBoost Rebuilt Engine — YZJA

Ford fiesta-stRebuilt Engine — YZJA

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Ford Fiesta ST 1.5 EcoBoost Engine History & Specs at a Glance

When the Mk8 Ford Fiesta ST launched, it introduced a highly advanced 1.5-litre three-cylinder EcoBoost engine, delivering 200 PS and featuring cylinder deactivation technology to balance hot-hatch performance with everyday efficiency.

2018
YZJA (200 PS) introduced in the Ford Fiesta ST Mk8, replacing the previous 1.6-litre four-cylinder unit. This "Dragon" engine features a timing chain for the camshafts but retains a wet belt (belt-in-oil) for the oil pump drive.
2021
Minor ECU mapping refinements and emissions updates, though the core YZJA architecture and 200 PS output remained unchanged.
2023
Final production year of the Ford Fiesta ST Mk8 before the model line was discontinued, cementing its status as a modern classic hot hatch.

Every engine fitted to the Ford Fiesta ST 1.5 EcoBoost is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Ford Fiesta ST 1.5 EcoBoost Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

YZJA — 1.5L Petrol (2018-2023)

Power Output: 200 PS (147 kW)
Years Fitted: 2018-2023

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Common failure points and repair options

Oil Pump Wet Belt Degradation

Affected: Ford Fiesta ST 1.5 EcoBoost (YZJA, 2018-2023)
Typical failure mileage: 60,000-100,000 miles

Root cause

While the camshafts are driven by a robust timing chain, the oil pump is driven by a wet belt (belt-in-oil). Over time, this belt can degrade and shed debris, potentially clogging the oil pickup strainer and leading to oil starvation if not addressed preventatively.

Repair options

Repair tier	Dealer price	Specialist price
Preventative Belt Replacement	£1,000-£1,500	£800-£1,200
Full Replacement - rebuilt/reconditioned engine	£4,500-£6,500+	£2,500-£4,000

Our recommendation

Given the high value and performance nature of the Ford Fiesta ST 1.5 EcoBoost, a professionally rebuilt engine with a new oil pump belt and updated components is the most reliable long-term solution. Do not attempt to run the vehicle if an oil pressure warning or sudden misfire occurs, as this can rapidly escalate to catastrophic failure.

Carbon Buildup & HPFP Wear

Affected: Ford Fiesta ST 1.5 EcoBoost (YZJA, 2018-2023)
Typical failure mileage: 50,000-90,000 miles

Root cause

Direct fuel injection bypasses the intake valves, allowing carbon to accumulate over time. Combined with the high stresses of the cylinder deactivation system, this can lead to rough idling, misfires, and high-pressure fuel pump wear.

Repair options

Repair tier	Dealer price	Specialist price
Minor/Preventative	£600-£1,200	£400-£800
Full Replacement - rebuilt/reconditioned engine	£4,500-£6,500+	£2,500-£4,000

Our recommendation

-> Compare rebuilt YZJA Ford Fiesta ST 1.5 EcoBoost engine prices

Don't Let Engine Failure Write Off Your Ford Fiesta ST 1.5 EcoBoost

Ignoring oil pressure warnings or performance degradation can quickly turn a manageable situation into a catastrophic engine failure. By comparing quotes through EnginesMarket, you secure a rebuilt or reconditioned Ford Fiesta ST 1.5 EcoBoost engine with upgraded components, a minimum 12-month unlimited-mileage warranty, and nationwide delivery-often at a fraction of the main dealer's £6,500+ replacement premium.

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FAQ

Ford Fiesta ST 1.5 EcoBoost Engine ReplacementFrequently Asked Questions

Everything Ford Fiesta ST 1.5 EcoBoost owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A full rebuilt or reconditioned Ford Fiesta ST 1.5 EcoBoost engine typically costs between £2,500 and £4,000, including supply and fit.

Rebuilt units include upgraded performance components and a 12-month warranty.
Main dealers often charge £6,500+ for the same replacement.
Used engines are a budget alternative, starting from around £600.

-> Compare Ford Fiesta ST 1.5 EcoBoost engine replacement quotes today.

The Ford Fiesta ST 1.5 EcoBoost uses a hybrid setup: a timing chain for the camshafts, but a wet belt for the oil pump.

Unlike the problematic 1.0 EcoBoost, the ST's cam drive is chain-driven and highly robust.
However, the oil pump wet belt can still degrade over time, making preventative replacement at 60,000 miles highly recommended to avoid oil starvation.

-> Get quotes for your Ford Fiesta ST 1.5 EcoBoost engine today.

Yes, absolutely. The Ford Fiesta ST retains strong market values, typically ranging from £8,000 to £16,000.

A full rebuilt engine replacement (£2,500-£4,000) represents a small fraction of the vehicle's total worth.
Investing in a warrantied, reconditioned unit preserves the car's performance and resale value far better than a cheap, unverified used engine.

-> Check if your Ford Fiesta ST 1.5 EcoBoost replacement is viable.

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Comparing quotes is completely free and specific to your exact vehicle. Simply enter your registration to confirm your exact Ford Fiesta ST 1.5 EcoBoost engine code, and we will match you with vetted UK specialists offering competitive, transparent prices on used, reconditioned, and rebuilt performance units.

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