Ford Fiesta 1.5 EcoBoost ST Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Ford Fiesta 1.5 EcoBoost ST engine specialists. Compare prices on reconditioned, rebuilt and used engines to find the most cost-effective solution for your vehicle.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £2,500 to £4,000
Used from £600 · Reconditioned from £1,600 · Common codes: YZJA
From £600
Tested, bare/short engine
From £1,600
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Ford Fiesta 1.5 EcoBoost ST Replacement Engineto Finding the Best Ford Fiesta 1.5 EcoBoost ST Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryFord Fiesta 1.5 EcoBoost ST - Engine History & Specs at a Glance
Launched as the high-performance flagship of the Fiesta range, the 1.5 EcoBoost ST variant debuted in the Mk8 generation, replacing the previous 1.6L four-cylinder with a more advanced, cylinder-deactivating three-cylinder turbocharged unit.
Variant HistoryFord Fiesta 1.5 EcoBoost ST - Engine History & Specs at a Glance
Launched as the high-performance flagship of the Fiesta range, the 1.5 EcoBoost ST variant debuted in the Mk8 generation, replacing the previous 1.6L four-cylinder with a more advanced, cylinder-deactivating three-cylinder turbocharged unit.
Ford Fiesta 1.5 EcoBoost ST
Fuel TypePetrol
Engine Size Range1.5L
Power Output Range200PS (147kW)Engine History Timeline
YZJA 1.5L Petrol, 200PS (147kW) - Introduced in the Mk8 Fiesta ST, featuring a 3-cylinder EcoBoost design with cylinder deactivation for improved efficiency without sacrificing performance.
YZJA (Facelift) 1.5L Petrol, 200PS (147kW) - Minor ECU and emissions refinements for the Mk8 facelift, maintaining the same core architecture and power output.
Key Specs Snapshot
Fuel TypePetrolEngine Size Range1.5LPower Output Range200PS (147kW)Years Produced2018-2023Every engine fitted to the Ford Fiesta 1.5 EcoBoost ST is covered below, with UK rebuilt pricing and known failure points.
Ford Fiesta 1.5 EcoBoost ST Engine Codes - Specifications & Replacement CostFord Fiesta 1.5 EcoBoost ST Engine Codes - Specifications & Replacement Cost
1.5L Petrol (2018-2023)
Power Output200PS (147kW)Years Fitted2018-2023
Compatible Trim Levels
- ST
- ST-2
- ST-3
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£600-£1,400
Reconditioned
Addressed known issues, tested
£1,600-£3,000
Rebuilt
Full teardown, upgraded internals
£2,500-£4,000
Common Failure
Coolant leaks from head gasket or block porosity, alongside turbocharger issues, typically observed after 60,000 miles.
The Ford Fiesta 1.5 EcoBoost ST is a high-performance unit that generally delivers strong reliability, but it is not immune to specific wear points. The YZJA code dominates replacement demand for this variant due to coolant intrusion and turbo-related failures. Rebuilt engines through EnginesMarket include upgraded components addressing these original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the Ford Fiesta 1.5 EcoBoost ST (YZJA) Overheats
Affected Vehicles
Ford Fiesta 1.5 EcoBoost ST (YZJA, 2018-2023)
Typical Failure Mileage
60,000-100,000 miles
Root Cause
Porosity in the engine block casting or head gasket degradation allows coolant to leak into the cylinders or oil galleries, creating a "milkshake" emulsion and leading to catastrophic overheating if ignored.
Why It Happens
Porosity in the engine block casting or head gasket degradation allows coolant to leak into the cylinders or oil galleries, creating a "milkshake" emulsion and leading to catastrophic overheating if ignored.
Dealer (parts + labour)
£1,200-£2,000
Specialist (parts + labour)
£800-£1,500
What it involves
Strip top end, replace head gasket, skim head, flush cooling system.
Suitability
Suitable only if the block is confirmed free of cracks and porosity via pressure testing.
1 - 2 daysDealer (parts + labour)
£3,500-£5,000
Specialist (parts + labour)
£2,500-£4,000
What it involves
Supply & fit, upgraded components addressing the original failure point, 12-month warranty.
Suitability
The right call when block porosity is confirmed or when overheating has warped the cylinder head.
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Minor/Preventative (Head Gasket Replace) Minor | £1,200-£2,000 | £800-£1,500 | Strip top end, replace head gasket, skim head, flush cooling system. | Suitable only if the block is confirmed free of cracks and porosity via pressure testing. | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £3,500-£5,000 | £2,500-£4,000 | Supply & fit, upgraded components addressing the original failure point, 12-month warranty. | The right call when block porosity is confirmed or when overheating has warped the cylinder head. | 1 - 2 days |
Our Recommendation
Our Recommendation
For Ford Fiesta 1.5 EcoBoost ST owners, a full reconditioned or rebuilt engine is often the most reliable long-term solution. Because coolant intrusion can be a structural block issue, simply replacing the head gasket may not prevent recurrence. A rebuilt unit replaces the flawed block entirely and comes with a robust warranty, protecting your performance investment.
Don't Let Engine Failure Write Off Your Ford Fiesta 1.5 EcoBoost ST
Whether you need a budget-friendly used unit or a comprehensively rebuilt engine with upgraded components, comparing quotes ensures you do not overpay. Every engine supplied through our network includes a minimum 12-month unlimited mileage warranty and nationwide delivery options, protecting you from main dealer premiums.
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Ford Fiesta 1.5 EcoBoost ST. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Ford Fiesta 1.5 EcoBoost ST Engine ReplacementFrequently Asked Questions
Question 1How much does a Ford Fiesta 1.5 EcoBoost ST engine replacement cost-
A full rebuilt Ford Fiesta 1.5 EcoBoost ST engine typically costs between £2,500 and £4,000 for supply only, while used units start from around £600.
- Prices vary based on the specific engine code (YZJA).
- Costs differ depending on whether you choose supply-only or a nationwide supply & fit package.
- Always compare multiple specialist quotes to ensure you are getting a competitive rate with a valid warranty.
Question 2What are the common signs of Ford Fiesta 1.5 EcoBoost ST engine failure-
Owners of the Ford Fiesta 1.5 EcoBoost ST should watch for persistent overheating, white smoke from the exhaust, and a noticeable loss of power or limp mode.
- A "milkshake" appearance on the oil filler cap indicates coolant has mixed with the engine oil.
- Rough idling or an illuminated check engine light can also point to EVAP purge valve or turbo issues.
- If the engine management light is flashing alongside these symptoms, stop driving immediately.
Question 3Is it worth replacing the engine in a Ford Fiesta 1.5 EcoBoost ST-
Given that Mk8 Ford Fiesta 1.5 EcoBoost ST models typically hold a market value between £12,000 and £22,000, a full rebuilt engine is a financially viable investment.
- The replacement cost (£2,500-£4,000) comfortably sits below the 60% replacement-to-value threshold.
- A rebuilt unit is highly recommended to protect your performance investment and ensure long-term reliability.
- Always weigh the replacement cost against the vehicle's current market value before committing.
Question 4How long does a Ford Fiesta 1.5 EcoBoost ST engine replacement take-
A standard supply-only delivery of a Ford Fiesta 1.5 EcoBoost ST engine takes 1 to 3 working days via nationwide courier.
- If you opt for a supply & fit service, the physical installation and testing process typically requires 1 to 2 days at a specialist garage.
- Total turnaround time from quote to completion is usually under a week.
- This depends entirely on parts availability and your chosen supplier's schedule.
Question 5What is the difference between the Fiesta 1.5 EcoBoost ST and the standard 1.0 EcoBoost engines-
The 1.5 EcoBoost ST (YZJA) is a high-performance, 200PS three-cylinder unit designed specifically for the ST variant, featuring a reinforced block and advanced turbocharging.
- Unlike the standard 1.0 EcoBoost, the 1.5 ST does not use a wet timing belt; it uses a more robust timing chain.
- The 1.5 ST also features cylinder deactivation technology to improve fuel efficiency when cruising.
- Always verify your exact engine code via your V5C logbook or registration before ordering a replacement.
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