01
Ford Fiesta
Generation/Chassis
Mk8
Badge(s)
1.0 EcoBoost (85hp, 100hp, 125hp)
Years
2018-2023
Ford SFJA/SFJB Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The revised 1.0-litre three-cylinder EcoBoost petrol engine fitted to modern Ford Fiesta, Focus, and Puma models. Reconditioned units are available from £1,800 , with 180 UK replacement requests logged in 2025 .
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£700
Reconditioned from
£1,800
Rebuilt from
£2,800
GB
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Quotes only from vetted UK engine specialists.
Key Specs
Ford SFJA/SFJB - Specifications at a Glance
Engine Code
SFJA / SFJB
Fuel
Petrol
Configuration
1.0L inline-3 turbocharged
Power Output(s)
85hp - 155hp (depending on tune)
Years Produced
2018-Present
UK Models Fitted
3 Ford models - full list in Compatibility below
2025 UK Replacement Requests
180
Replaced
Ford EcoBoost 1.0 (early)
Replaced By
N/A (Current generation)
Most Common Failure
Wet belt degradation and oil pump drive wear
Reconditioned Price Range
£1,800-£3,000 supply-only
Vetted UK specialists for SFJA/SFJB replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Ford Models Use the SFJA/SFJB-
The SFJA and SFJB codes represent the updated 1.0L EcoBoost engine family, widely fitted across Ford's modern compact lineup to meet stricter emissions standards while maintaining punchy, efficient performance.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Ford Fiesta | Mk8 | 1.0 EcoBoost (85hp, 100hp, 125hp) | 2018-2023 | |
| Ford Puma | Mk2 | 1.0 EcoBoost (95hp, 125hp, 155hp ST-Line) | 2019-Present | |
| Ford Focus | Mk4 | 1.0 EcoBoost (100hp, 125hp) | 2018-Present |
02
Ford Puma
Generation/Chassis
Mk2
Badge(s)
1.0 EcoBoost (95hp, 125hp, 155hp ST-Line)
Years
2019-Present
03
Ford Focus
CROSS-BRAND
SFJA/SFJB is documented across 3 BMW applications spanning Ford Fiesta, Ford Puma, Ford Focus. Registration lookup confirms the exact suffix before quotes are sent.
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Prices
Ford SFJA/SFJB Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £700-£1,500 | £1,155-£2,150 | 3-6 months |
Reconditioned | £1,800-£3,000 | £2,255-£3,650 | 12-24 months |
Rebuilt | £2,800-£4,200 | £3,255-£4,850 | 12-24 months |
The replacement cost for a Ford SFJA/SFJB engine is heavily influenced by whether the wet belt has been proactively replaced and the condition of the oil pump drive. Units with documented belt replacement history command a slight premium but carry significantly lower risk for the buyer. For a full breakdown of how component condition affects pricing, see our reconditioned engine cost guide.
Labour Guide
Fitting a SFJA/SFJB typically takes 7-10 hours at £65/hr (independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Ford SFJA/SFJB Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the SFJA/SFJB, based on real-world data and verified failure patterns.
Verified issue focus: Wet belt degradation and oil pump drive wear.
1. Wet Belt Degradation and Oil Pump Drive Failure - 2018+ revisions
1. Wet Belt Degradation and Oil Pump Drive Failure - 2018+ revisions
Typical onset:
80,000-120,000 miles
What happens:
The cambelt runs in oil. Over time, or if incorrect oil specifications are used, the belt degrades and sheds rubber debris. This debris blocks the oil pickup strainer, starving the oil pump and turbocharger of lubrication, which can lead to catastrophic engine seizure.
Repair vs replace:
If caught early during routine maintenance, a belt replacement costs £600-£1,200. If the oil pump or turbo has already failed due to starvation, a full SFJA/SFJB engine replacement is the only reliable solution.
Read more about this issue
The SFJA/SFJB revisions feature an improved wet belt design compared to the earliest 1.0 EcoBoost engines, making them notably more durable. However, strict adherence to Ford's specified oil (e.g., WSS-M2C948-B) and an 8-10 year preventative belt replacement interval remain critical to prevent failure .
Compare rebuilt SFJA/SFJB prices with the failure already addressed
Engine Variants
SFJA/SFJB Sub-Codes Explained - Which One Is in Your Car-
INTRO: The SFJA and SFJB codes represent the updated 1.0L EcoBoost family. While they share the same core architecture and improved wet belt design, they differ primarily in ECU mapping, power output, and specific vehicle applications. - Fitted to: Ford Fiesta Mk8, Ford Puma Mk2 (e.g., 85hp-100hp variants). - Key technical difference: Calibrated for lower boost pressure and standard efficiency mapping, prioritising fuel economy in lighter chassis applications. - Sub-code-specific failure note: Shares the family wet belt failure pattern; no unique hardware flaws documented. - Interchange note: Generally interchangeable with SFJB mechanically, but requires ECU remapping and potentially different turbocharger plumbing to match the host vehicle's power target. - Fitted to: Ford Focus Mk4, Ford Puma Mk2 (e.g., 125hp-155hp ST-Line variants). - Key technical difference: Higher boost pressure, revised turbocharger, and updated cooling management to handle higher-stress applications. - Sub-code-specific failure note: Shares the family wet belt failure pattern; higher-stress tunes make strict oil maintenance even more critical.
The engine code is stamped on the engine block, typically near the oil filter housing or on a sticker on the timing cover. It is also listed on your V5C logbook under "Engine Capacity" or via a VIN decoder. Not sure- Enter your registration above for instant confirmation.
Easily Confused
JQMA 1.6L EcoBoost engine
JQMA (1.6L EcoBoost) - The higher-output 1.6L EcoBoost it partially replaced had different thermal characteristics, lacking the specific block porosity issues that later plagued the M8DA's 1.5L casting.
Alternative / Next-Gen Code
M9DA (1.5L EcoBoost revised)
Ford's updated revision of this architecture, featuring revised head gasket materials and block casting to directly address the M8DA's documented coolant intrusion failures.
Related JLR Variants
M8DB
A marginal calibration variant of the same 1.5L hardware, sharing the identical cooling system weaknesses and non-interchangeable ECU mapping.
Confirm the exact SFJA/SFJB fitment
The engine code is stamped on the engine block, typically near the oil filter housing or on a sticker on the timing cover. It is also listed on your V5C logbook under "Engine Capacity" or via a VIN decoder. Not sure- Enter your registration above for instant confirmation.
Buying Guide
Buying a Replacement SFJA/SFJB - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used SFJA/SFJB is a viable option only if it comes with verifiable service history proving the wet belt was replaced within the last 20,000 miles or 3 years. Without this documentation, the risk of hidden oil starvation damage is too high.
Reconditioned:
The smartest choice for most owners. A proper reconditioned SFJA/SFJB will include a brand-new wet belt kit, an updated oil pump drive, and refreshed turbocharger seals, directly addressing the engine's primary failure points before they occur.
Rebuilt:
Justified for high-mileage Puma or Focus models where the cylinder bore or crankshaft has suffered wear. A full rebuild should include line-boring, new pistons, and the latest revised wet belt components to restore factory reliability.
Supply & Fit Line:
Our network provides nationwide supply and fit options, ensuring your replacement SFJA/SFJB is installed by specialists with a minimum 12-month warranty.
Vehicle Value Note:
Host vehicles like the Ford Fiesta Mk8 and Puma Mk2 typically retain values between £6,000 and £20,000 . With reconditioned SFJA/SFJB units starting from £1,800, replacement represents a safe and financially viable investment for the vast majority of these modern cars.
Compare SFJA/SFJB Engine Prices Now
Related Engines
Engines Related to the Ford M8DA
Explore engines that are closely related to the Ford SFJA/SFJB, including its predecessor, successor, and key family variants.
Predecessor
JQMA 1.6L EcoBoost engine
JQMA (1.6L EcoBoost) - The higher-output 1.6L EcoBoost it partially replaced had different thermal characteristics, lacking the specific block porosity issues that later plagued the M8DA's 1.5L casting.
Successor
M9DA (1.5L EcoBoost revised)
Ford's updated revision of this architecture, featuring revised head gasket materials and block casting to directly address the M8DA's documented coolant intrusion failures.
Sibling
M8DB
A marginal calibration variant of the same 1.5L hardware, sharing the identical cooling system weaknesses and non-interchangeable ECU mapping.
FAQ
Ford M8DAFrequently Asked Questions
Question 1How much does a Ford M8DA engine replacement cost in the UK-
A reconditioned Ford M8DA engine costs between £1,600 and £3,000 for supply only, or £2,120 to £3,715 fully fitted by an independent specialist. Used units start around £600 but carry a high risk due to known block porosity. Labour typically adds a £520-£715 premium to the supply cost.
- Used units start around £600 but carry a high risk due to known block porosity.
- Labour typically adds a £520-£715 premium to the supply cost.
Question 2What is the most common problem with the Ford M8DA 1.5 EcoBoost-
The dominant failure is internal coolant leakage caused by cylinder block porosity or head gasket degradation, typically emerging between 60,000 and 100,000 miles. Symptoms include unexplained coolant loss without external leaks, white exhaust smoke, and rough idling. Ignoring this leads to oil dilution and catastrophic bearing failure.
- Symptoms include unexplained coolant loss without external leaks, white exhaust smoke, and rough idling.
- Ignoring this leads to oil dilution and catastrophic bearing failure.
Question 3Which Ford models use the M8DA engine-
The M8DA 1.5L EcoBoost was fitted to the Ford Focus (Mk3/Mk4), Kuga (Mk2/Mk3), Mondeo (Mk5), and Grand C-Max from late 2014 onwards. It serves as the standard 150hp tune across these mainstream passenger and SUV models. Always verify your specific chassis via registration lookup before ordering parts.
- It serves as the standard 150hp tune across these mainstream passenger and SUV models.
- Always verify your specific chassis via registration lookup before ordering parts.
Question 4Should I buy a used or reconditioned M8DA engine-
A reconditioned M8DA is strongly recommended over a used unit due to the high risk of latent block porosity in this specific engine family. A proper recon includes a pressure-tested block, new head gasket, and updated coolant seals. A used unit may simply pass the same ticking time bomb to your car.
- A proper recon includes a pressure-tested block, new head gasket, and updated coolant seals.
- A used unit may simply pass the same ticking time bomb to your car.
Question 5How do I know if my car has the M8DA engine code-
The M8DA code is stamped on a machined pad on the engine block, typically near the bellhousing or above the oil filter housing, and is listed on your V5C document. It is frequently confused with the M8DB (different tune), M9DA (revised block), or older 1.6L EcoBoost codes like JQMA. Fitting the wrong revision causes ECU and loom incompatibility.
- It is frequently confused with the M8DB (different tune), M9DA (revised block), or older 1.6L EcoBoost codes like JQMA.
- Fitting the wrong revision causes ECU and loom incompatibility.
Compare Ford M8DA Engine Prices Today
Get a free, no-obligation price comparison tailored to your exact M8DA sub-code and vehicle. Our registration lookup confirms your fitment before any quotes are sent, ensuring you receive accurate, compatible pricing. With reconditioned Ford M8DA units starting from £1,600, comparing takes two minutes and could save you hundreds on your replacement.
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Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
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