Parts for your 2009 Subaru Impreza-Egr valve

2009 Subaru Impreza EGR Valve: Is it there, and does it matter?

For a 2009 Subaru Impreza running on petrol (the common AU/NZ models with EJ20/EJ25, including WRX), there isn’t an external EGR valve fitted. On the 2009 Impreza 2.0D diesel (EE20), there is an electronically controlled, cooled EGR system. So, whether an EGR valve is relevant depends on the engine: petrol models don’t use one, the diesel does.

Technical references back this up. Subaru’s 2009MY Impreza factory service information (STIS) shows no EGR components in the petrol EJ engine emission-control diagrams, while the EE20 diesel section details a cooled EGR circuit and valve. Genuine parts catalogues for 2009 Impreza (e.g., Subaru FAST/EPC) list no EGR valve for petrol variants by VIN, but they do list an EGR valve and cooler for the 2.0D. Subaru’s New Car Features documentation for EJ petrol engines of this era also describes meeting ADR/Euro emissions without external EGR by using variable valve timing, efficient combustion chambers and high-efficiency catalytic converters.

Why no EGR on the petrol 2009 Impreza? Subaru engineered the EJ petrol engines to meet emissions targets through:

• Active valve timing (AVCS) to manage internal EGR via valve overlap, trimming NOx without an external valve.
• High tumble/mixture motion and precise fuel control to keep combustion clean.
• Robust catalytic aftertreatment to mop up remaining pollutants.

That combo meant an external EGR assembly wasn’t required on petrol models—simplifying the layout under the bonnet and removing a potential soot-related maintenance item. If the car is the 2.0D diesel, it absolutely does have an EGR valve and cooler, as EGR is critical on modern diesels to control NOx. Diesel owners should expect EGR soot build-up over time and may need periodic cleaning or valve replacement depending on driving pattern (short trips tend to clog sooner).

If chasing “EGR” fault symptoms on a petrol 2009 Impreza, look elsewhere: common culprits include a dirty throttle body, sticky PCV valve, intake air leaks, MAF contamination or ageing O2 sensors—issues that can mimic drivability faults often blamed on EGR in other cars.

Technical sources consulted

• Subaru 2009MY Impreza Factory Service Manual (STIS): Emission Control sections for EJ petrol and EE20 diesel.
• Subaru Genuine Parts electronic catalogue (FAST/EPC) for 2009 Impreza VIN applications.
• Subaru New Car Features (Engine/Emission chapters) for EJ and EE20.

Popular questions about the 2009 Subaru Impreza EGR valve

Does a 2009 Subaru Impreza have an EGR valve?
Petrol models: no. The EJ20/EJ25 and WRX variants don’t use an external EGR valve. Diesel 2.0D (EE20): yes, it uses a cooled, electronically controlled EGR system as part of its NOx control strategy.

How can someone confirm if their 2009 Impreza has EGR?
Check the fuel type first—diesel models will indicate “Diesel” on the rego/under-bonnet labels. A quick look down the back of the engine on a diesel usually shows the EGR cooler/pipework. A VIN lookup in the Subaru parts catalogue will also tell you definitively.

What issues can feel like a bad EGR on a petrol 2009 Impreza?
On petrol variants there’s no EGR, so similar symptoms often trace to a dirty throttle body, PCV issues, intake leaks, a tired MAF, or oxygen sensors. Good servicing—cleaning the throttle body, checking PCV and vacuum lines—usually sorts it.