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Subaru EJ257 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The Subaru EJ257 is a 2.5-litre turbocharged boxer engine developed by Subaru Tecnica International (STI) for the flagship WRX STI models [0†L5-L6][9†L31-L32]. Reconditioned units from £2,500 - the ultimate Subaru performance engine, factory-rated from 280 hp to over 300 hp.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£2,000
Reconditioned from
£2,500
Rebuilt from
£4,000
GB
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Key Specs
Subaru EJ257 - Specifications at a Glance
Engine Code
EJ257
Fuel
Petrol
Configuration
2.5L turbocharged flat-four (Boxer), DOHC 16-valve, semi-closed deck
Power Output(s)
280 hp (2005-2007), 300 hp (2008-2012), 301-341 hp (later variants)
Years Produced
2005-2021 (UK market: 2005-2021)
UK Models Fitted
2 models - full list in Compatibility below
2025 UK Replacement Requests
[Not in proprietary data - see compatibility demand]
Replaced
EJ207 (2.0L turbo)
Replaced By
FA24 (2.4L turbo, 2022+ WRX)
Most Common Failure
Head gasket failure / cylinder 4 knock / ringland failure
Reconditioned Price Range
£2,500-£4,500 supply-only
Vetted UK specialists for EJ257 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Subaru Models Use the EJ257-
The EJ257 was Subaru's flagship performance engine, fitted exclusively to the WRX STI from 2005 until the engine's retirement in 2021. It replaced the 2.0-litre EJ207 in export markets, offering greater low-end torque and stronger mid-range power.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Subaru Impreza WRX STI | GD (2005-2007) | WRX STI | 2005-2007 | |
| Subaru Impreza WRX STI | GE/GH (2008-2014) | WRX STI | 2008-2014 | |
| Subaru WRX STI | VA (2014-2021) | WRX STI | 2014-2021 |
02
Subaru Impreza WRX STI
03
Subaru WRX STI
CROSS-BRAND
EJ257 is documented across 3 BMW applications spanning Subaru Impreza WRX STI, Subaru WRX STI. Registration lookup confirms the exact suffix before quotes are sent.
Not sure which engine your car has?
Not sure which engine your car has- Enter your registration above - we'll confirm your exact EJ257 fitment before any quotes are sent.
Prices
Subaru EJ257 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £2,000-£3,000 | £2,900-£4,000 | 3-6 months |
Reconditioned | £2,500-£4,500 | £3,500-£5,700 | 12-24 months |
Rebuilt | £4,000-£6,000 | £5,200-£7,200 | 12-24 months |
All . Fitted = supply price + labour band below.
Labour Guide
Fitting an EJ257 typically takes 10-14 hours at £65-£85/hr (independent Subaru specialist) - confirm exact labour when comparing quotes.
Price Factors
What genuinely moves the price for THIS engine: whether the engine has documented head gasket replacement (MLS units), whether the timing belt has been serviced, the condition of the turbocharger (the EJ257 uses a larger VF48 turbo compared to the EJ255's TD04), and whether the engine has been modified. A used EJ257 without history is a significantly higher-risk purchase than one with documented maintenance and a compression test. See our full reconditioned engine cost guide.
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Common Problems
Subaru EJ257 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the EJ257, based on real-world data and verified failure patterns.
Verified issue focus: Head gasket failure / cylinder 4 knock / ringland failure.
Post-2008 EJ257 units received dual AVCS (variable intake and exhaust valve timing), raised compression from 8.0:1 to 8.2:1, and power increased to 300 hp. The later engines are more refined but share the same fundamental vulnerabilities. The best EJ257 to buy is one with documented head gasket replacement (MLS) and timing belt service already completed .
Compare rebuilt EJ257 prices with the failures already addressed
Engine Variants
EJ257 Variants - Which One Is in Your Car-
INTRO: While the EJ257 is a single engine code, there are distinct revisions across the production run. The differences matter - particularly when buying a replacement, as not all EJ257 variants are direct swaps. ### EJ257 - 2005-2007 (GD Impreza WRX STI) - Fitted to: Subaru GD Impreza WRX STI (2005-2007) - Key technical difference: 2.5-litre turbo petrol F4, 6-speed manual. Single AVCS (variable intake valve timing only). Compression ratio: 8.0:1. Power: 206 kW (280 hp) at 5,600 rpm, 392 Nm at 4,000 rpm. VF39 turbocharger. - Sub-code-specific failure note: Shares the family head gasket, ringland, and timing belt patterns. Early EJ257s are the most prone to ringland failure. - Interchange note: Direct swap with later EJ257 variants requires ECU reflash and may need different turbo plumbing. ### EJ257 - 2008-2014 (GE/GH Impreza WRX STI) - Fitted to: Subaru GE/GH Impreza WRX STI (2008-2014) - Key technical difference: Dual AVCS (variable intake and exhaust valve timing). Compression ratio raised to 8.2:1. Power: 221 kW (300 hp) at 6,000 rpm, 407 Nm at 4,000 rpm. VF48 turbocharger (larger than the earlier VF39). - Sub-code-specific failure note: Shares the family patterns. The VF48 turbo is more durable than the VF39 but still suffers oil starvation if maintenance is poor. The higher compression and power output place additional stress on head gaskets and ringlands. - Interchange note: Not a straight swap with earlier EJ257s - ECU, turbo, and wiring loom differ significantly. ### EJ257 - 2014-2021 (VA WRX STI) - Fitted to: Subaru VA WRX STI (2014-2021) - Key technical difference: Dual AVCS. Power: 221 kW (300 hp) at 6,000 rpm, 407 Nm at 4,000 rpm. Revised ECU calibration and improved cooling. Last variant of the EJ engine family. - Sub-code-specific failure note: The later EJ257s are more refined but share the same fundamental vulnerabilities. Ringland failure remains a concern on modified cars. - Interchange note: Not a straight swap with earlier EJ257s without full ECU, loom, and ancillaries.
The engine code is stamped on the top of the engine block, near the bellhousing mating face - visible from above with a torch. On Impreza STI models, the intercooler may need to be moved to see the stamp. It's also listed on the V5C registration document. Enter your registration above if you're unsure - we'll confirm your exact EJ257 variant before any quotes are sent.
Easily Confused
EJ207
- the 2.0-litre turbo that powered earlier WRX STI models (until 2005). The EJ257 replaced it in export markets with greater displacement, more low-end torque, and a stronger semi-closed deck block.
Alternative / Next-Gen Code
FA24
- the 2.4-litre turbo that replaced the EJ257 in the 2022+ WRX. It features direct injection, a timing chain instead of a belt, and significantly improved emissions and fuel economy while delivering similar power.
Related JLR Variants
EJ255
- the 2.5-litre turbo found in the Impreza WRX (non-STI), Forester XT, and Legacy GT. It shares the same block but uses a smaller TD04 turbo (vs VF39/VF48), has lower compression, and less aggressive tuning. Not a direct swap without ECU changes.
Confirm the exact EJ257 fitment
The engine code is stamped on the top of the engine block, near the bellhousing mating face - visible from above with a torch. On Impreza STI models, the intercooler may need to be moved to see the stamp. It's also listed on the V5C registration document. Enter your registration above if you're unsure - we'll confirm your exact EJ257 variant before any quotes are sent.
Buying Guide
Buying a Replacement EJ257 - 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 EJ257 makes sense only if it comes with documented evidence of head gasket replacement (MLS units), a recent timing belt service, and a compression test showing healthy cylinder pressures. Without this documentation, a used EJ257 is a very high-risk purchase - ringland failure and head gasket failure are common, and many have been modified and abused. Given the EJ257 is an interference engine, any used unit without timing belt history is a gamble.
Reconditioned:
A proper EJ257 recon addresses the known weak points: new MLS head gaskets (not factory-spec), new timing belt kit with tensioner and idlers, new water pump, new turbocharger oil feed lines, and a thorough inspection of the turbocharger (VF39/VF48). Reconditioned units typically include a 12-month warranty and are the sweet spot for most UK owners - you get the reliability upgrades without the cost of a full rebuild.
Rebuilt:
A full EJ257 rebuild is justified when you want to keep a specific car (e.g. a clean STI with low body mileage) and want the engine to last another 100,000+ miles. An upgraded rebuild should include forged pistons (the factory cast pistons are a weak point), ARP head studs, a fully reconditioned turbocharger, a new oil pump, and often upgraded bearings. Budget £4,000-£6,000 for a quality rebuild with forged internals.
Supply & Fit Line:
All of our vetted UK Subaru specialists offer supply-only or full supply-and-fit - nationwide delivery and recovery available, with warranties that cover both parts and labour.
Vehicle Value Note:
The EJ257 sits exclusively in WRX STI models - values range from £8,000-£20,000 for the GD/GE/GH generations, £15,000-£35,000 for the VA generation, depending on condition and mileage. A reconditioned EJ257 at £2,500-£4,500 represents 15-50% of vehicle value - generally viable for most examples. However, for a high-mileage (£8,000-£10,000) GD STI, a full rebuild at £4,000-£6,000 may approach 50-60% of the vehicle's value. In those cases, evaluate the car's overall condition, rust, and interior before committing. A clean, low-mileage STI justifies the spend; a tired one may be better broken for parts .
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Related Engines
Engines Related to the Subaru EJ257
Explore engines that are closely related to the Subaru EJ257, including its predecessor, successor, and key family variants.
Predecessor
EJ207
- the 2.0-litre turbo that powered earlier WRX STI models (until 2005). The EJ257 replaced it in export markets with greater displacement, more low-end torque, and a stronger semi-closed deck block.
Successor
FA24
- the 2.4-litre turbo that replaced the EJ257 in the 2022+ WRX. It features direct injection, a timing chain instead of a belt, and significantly improved emissions and fuel economy while delivering similar power.
Sibling
EJ255
- the 2.5-litre turbo found in the Impreza WRX (non-STI), Forester XT, and Legacy GT. It shares the same block but uses a smaller TD04 turbo (vs VF39/VF48), has lower compression, and less aggressive tuning. Not a direct swap without ECU changes.
Sibling
EJ20
- the 2.0-litre family that includes both naturally aspirated and turbo variants. The EJ20 was the mainstay for non-STI models and JDM STI models, but with less displacement and torque than the EJ257.
FAQ
Subaru EJ257Frequently Asked Questions
Question 1How much does a Subaru EJ257 engine replacement cost-
A reconditioned EJ257 supply-only costs £2,500-£4,500, with fitted prices from £3,500-£5,700. Used units start from £2,000 supply-only. Rebuilt engines with forged internals cost £4,000-£6,000 supply-only.
- Used units start from £2,000 supply-only.
- Rebuilt engines with forged internals cost £4,000-£6,000 supply-only.
Question 2What are the most common EJ257 engine problems-
The EJ257 suffers from head gasket failure (70k-120k miles), piston ringland failure (especially on modified cars), timing belt failure if the 100,000 km / 5-year service is missed, and turbocharger wear on the VF39/VF48 units. Head gasket replacement with MLS gaskets costs £1,200-£2,500. Forged piston rebuild costs £2,500-£4,500. Preventative timing belt service £500-£900.
- Head gasket replacement with MLS gaskets costs £1,200-£2,500.
- Forged piston rebuild costs £2,500-£4,500.
- Preventative timing belt service £500-£900.
Question 3Which Subaru models use the EJ257 engine-
The EJ257 was fitted exclusively to the Subaru Impreza WRX STI (GD: 2005-2007; GE/GH: 2008-2014) and the Subaru WRX STI (VA: 2014-2021). The GD generation uses a VF39 turbo; the GE/GH and VA generations use a VF48 turbo.
- The GD generation uses a VF39 turbo.
- The GE/GH and VA generations use a VF48 turbo.
Question 4Should I buy a used or reconditioned EJ257-
A reconditioned EJ257 is the safer choice - it includes new MLS head gaskets, a full timing kit, and a 12-month warranty. Used units are only recommended with documented head gasket and timing belt history, plus a compression test. A used EJ257 without history is a very high-risk purchase.
- Used units are only recommended with documented head gasket and timing belt history, plus a compression test.
- A used EJ257 without history is a very high-risk purchase.
Question 5What’s the difference between EJ257 and EJ255-
The EJ257 is the STI-spec engine with stronger internals (semi-closed deck block, different pistons, larger VF39/VF48 turbo) and 280-300 hp. The EJ255 is the WRX-spec engine with a smaller TD04 turbo, open-deck block, and 227-265 hp. See the EJ255 page for details
- The EJ257 is more powerful and more expensive to replace.
- They are not directly interchangeable without ECU and wiring changes.
Question 6How long does an EJ257 engine last-
With regular maintenance (timing belt every 100,000 km / 5 years, oil changes every 5k miles), an EJ257 can exceed 150,000 miles. Ringland failure is the main limit on modified or poorly maintained cars. Head gasket failure often occurs around 80k-120k miles unless upgraded.
- Ringland failure is the main limit on modified or poorly maintained cars.
- Head gasket failure often occurs around 80k-120k miles unless upgraded.
Compare Subaru EJ257 Engine Prices Today
Get free, no-obligation EJ257 engine quotes tailored to your exact variant and model. Our registration lookup confirms fitment before any quotes are sent, so you only hear from specialists who can actually supply the right unit. With reconditioned EJ257 units from around £2,500, comparing takes two minutes and could save four figures.
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Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
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