Subaru Forester Engine Replacement in Phoenix
Head gasket failure is why most Forester owners end up reading a page like this one.
The Forester is the Subaru that generates the most engine enquiries here, and head gasket failure on the naturally aspirated EJ25 is usually the reason. It is a common enough failure mode that it shapes the entire buying decision.
The naturally aspirated cars use SOHC EJ25 variants: the EJ251 and later EJ253, which gained i-AVLS variable valve lift from around 2006. The turbocharged XT models use the DOHC EJ255, which is a different engine with different supporting hardware.
From 2014 the Forester moved to the FB25, a direct-injection engine that is not interchangeable with the EJ25. If your car sits near that changeover, confirm which you have.
The head gasket question cuts both ways. A used EJ25 can arrive carrying exactly the same latent problem, so ask what has been done to the gaskets on any replacement unit and with what parts.
Do not buy the same problem twice
The head gasket issue on the naturally aspirated EJ25 is common enough that a used replacement engine has a meaningful chance of carrying it too. That is the specific risk on this vehicle, and it is avoidable by asking one question: what has been done to the gaskets on the unit you are selling me, and with which parts?
A supplier who has addressed them will say so and name the parts. One who has not may still be selling a perfectly good engine, but you should know which situation you are in before it ships, not after it is installed and the labour is spent.
The XT turbo is a different engine
The turbocharged Forester XT uses the EJ255, which is a different engine from the naturally aspirated EJ251 and EJ253. They share a displacement and a general layout but differ in internals, compression ratio and forced-induction hardware. An NA EJ25 is not a substitute for an XT engine, and an XT engine in an NA car creates problems the original engine management cannot address.
This matters because the XT is often the engine people search for, and the EJ255 turns up in listings that do not distinguish it clearly from the NA variants. If your Forester is an XT, confirm the EJ255 stamp on the block before ordering.
What to have ready when you request a Forester engine
Three facts settle most Forester engine orders: the generation, whether the car is naturally aspirated or a turbo XT, and which engine code is stamped on the block. The XT versus NA distinction is the one most often left out of a request, and it is the one that turns a correct order into the wrong engine.
If your Forester sits near the 2014 changeover boundary, where the FB25 replaced the EJ25 on non-turbo models, confirm the stamped code rather than relying on the model year. The two engines are not interchangeable.
Subaru Forester engines by generation
Two generations, each split between naturally aspirated and turbocharged XT models.
| Generation | Years | Trim | Engine |
|---|---|---|---|
| SG | 2003–2008 | Naturally aspirated | EJ251 / EJ253 |
| XT turbo | EJ255 | ||
| SH | 2009–2013 | Naturally aspirated | EJ253 |
| XT turbo | EJ255 |
Where Subaru Forester orders go wrong
- Naturally aspirated and turbocharged XT applications use different engines entirely.
- The FB25 from 2014 is not interchangeable with the EJ25.
- Ask specifically what has been done about head gaskets on any used EJ25.
- Timing belt, tensioner and water pump belong in the installation budget on this family.
None of this needs to be worked out on your own. The Engine Finder asks for the year, model and trim and does the identification from there. The engine code field is optional precisely because most people do not have it.
Check availability for your Subaru Forester
Year, trim and ZIP is enough to start. If you have the VIN it removes the guesswork entirely.
Common questions
Should I replace my Forester engine or do the head gaskets?
It depends on whether it overheated and what that did to the heads. A gasket job on a boxer engine is labour-heavy, and if the heads need machining the cost moves toward a replacement quickly. Get the heads assessed first, and if you do replace, ask what has been done to the gaskets on the replacement, because a used EJ25 can carry the same latent problem.
Related pages
- EJ25 EngineSubaru’s 2.5 boxer, head gaskets included.
- EJ20 EngineThe 2.0 Subaru boxer from the JDM WRX and STI.
- Subaru ImprezaWRX and STI use different turbocharged engines.
- Subaru EnginesSubaru boxer engines, head gaskets, and what replacement involves.
- Repair or Replace Your EngineWhether to spend anything at all, before deciding what to spend it on.
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