Parts for your 2009 Subaru Forester-Egr valve

2009 Subaru Forester EGR valve — what’s fitted, what’s not, and what to service

For the 2009 Subaru Forester (SH series), whether there’s an EGR valve depends on the engine. The common 2.5‑litre petrol (EJ253) and the turbo petrol (EJ255) do not use an external EGR valve. The 2.0‑litre turbo‑diesel (EE20) does use an electronically controlled EGR valve with an EGR cooler.

Technical sources referenced to reach this call include the Subaru Forester 2009 (SH) Workshop Manual — Engine (EJ/EE) Emission Control sections, the Subaru FAST electronic parts catalogue for SH models, and Subaru’s Technical Information System (STIS). In the EJ253/EJ255 documentation and parts listings there’s no EGR valve assembly shown, while the EE20 diesel sections clearly show the EGR valve and cooler as part of the emissions system.

Why no EGR on the 2.5 petrol? Subaru leans on precise fuel/ignition control, active valve timing/lift, and the three‑way catalytic converter to manage NOx. Those strategies make an external EGR valve unnecessary on the EJ253/EJ255 of this era. If someone’s under the bonnet of a petrol SH Forester hunting an EGR, they won’t find one — don’t mix it up with the separate secondary‑air system fitted to some petrol Subarus for cold‑start emissions.

For owners of the 2009 Forester 2.0D (EE20), the EGR valve is a key emissions component. It meters a portion of exhaust back into the intake to lower combustion temperatures and cut NOx. On the EE20 it’s ECU‑controlled and paired with an EGR cooler, working alongside the DPF. Over time, soot and a bit of oil mist can gum up the valve and passages, leading to rough idle, flat spots, smoke, poor economy, or fault codes like P0400–P0409. As part of regular servicing, it’s smart to inspect and, if needed, clean the EGR every 40–60,000 km — earlier for lots of city driving or short trips. Use intake/EGR‑safe cleaner, replace gaskets, and be ready to top up/bleed coolant if the cooler is removed. A scan tool helps command the valve and clear codes, some shops perform an idle relearn afterwards. Replacement is straightforward for a competent tech (often 1–2 hours), but let everything cool first as the cooler and lines can be hot. Keeping on top of quality low‑ash oil, good‑quality diesel, healthy PCV function, and giving the car regular longer runs (which also helps DPF regeneration) will reduce build‑up. Don’t be tempted to blank or delete the EGR — that’s illegal in Australia and New Zealand, can trigger warning lights, and may cause engine/DPF issues. If the valve sticks, throws repeated EGR flow codes, or cleaning doesn’t restore smooth operation, a new OEM‑spec valve is the way to go for reliable, legal performance.

• Petrol EJ253/EJ255: no external EGR valve fitted.
• Diesel EE20: EGR valve and cooler fitted, service/clean as needed.

FAQs

Does my 2009 Forester 2.5 petrol have an EGR valve?
No. The EJ253 petrol in the SH Forester doesn’t use an external EGR valve. It relies on engine management and the catalytic converter to control NOx. If you’re chasing a rough idle or a code, look elsewhere — things like MAF, vacuum leaks, or the secondary‑air system (where fitted) are more likely.

How often should the diesel EGR be cleaned or replaced?
Inspect and clean around every 40–60,000 km, sooner for lots of city or short‑trip use. Replace only if it’s sticking, fails tests with a scan tool, or keeps throwing EGR flow codes after a proper clean and new gaskets. Quality fuel and longer runs help keep it cleaner for longer.

What are the signs of a failing EGR on a 2009 Forester diesel?
Common signs include rough idle, hesitation, excess smoke, reduced economy, limp mode, and codes such as P0401/P0402. If you notice these, a proper inspection of the EGR valve and cooler passages is worthwhile before parts swapping.