Parts for your 2015 Subaru Impreza-Egr valve

2015 Subaru Impreza EGR Valve — What’s Fitted and What Isn’t

Short answer: a factory EGR valve isn’t used on the 2015 Subaru Impreza 2.0‑litre petrol (FB20) found in Australia and New Zealand. That’s not a quirk, it’s by design. Technical references that back this up include the Subaru Factory Service Manual for 2015MY Impreza (GP/GJ) under Emission Control, which details EVAP, PCV, secondary air injection (on PZEV variants), oxygen sensors, catalytic converters and tumble generator valves, but no EGR valve, the Subaru FAST/parts catalogue for 2015 Impreza (GP/GJ), which lists no EGR valve or EGR cooler assembly for the petrol engine, and North American EPA/CARB certification data for 2015 Impreza petrol models that indicate no external EGR system. Trade databases such as Mitchell1/ProDemand and ALLDATA also show no EGR component for the 2015 FB20 petrol layout.

Why no EGR? The FB20 uses active valve timing (AVCS) and careful fuel/ignition calibration to achieve the same emissions and combustion temperature control outcomes that older engines needed an external EGR valve for. Some markets also got a secondary air injection system to clean up cold-start hydrocarbons. This combo, plus a three‑way cat and wide‑range O2 feedback, meets ADR/Euro emissions without adding an EGR circuit. Subaru only introduced cooled EGR on later direct‑injected models (e.g., fifth‑gen Impreza from 2017), where it helps knock control and efficiency with DI.

So if someone’s hunting an EGR valve under the bonnet of a 2015 Impreza petrol, there isn’t one to replace. If it’s behaving like a “gummed EGR” car—rough idle, pinging, or lean codes—chances are the culprit sits elsewhere. Common places to look include:

• Secondary air injection valves and pump (if equipped) sticking or failing (P0410‑series codes)
• PCV valve and hoses clogging or cracking
• Vacuum leaks at the intake manifold or around the tumble generator valves
• Dirty throttle body or MAF sensor skewing airflow readings
• Ageing upstream O2 (A/F) sensor affecting trims

Preventative servicing that actually helps on these cars: clean the throttle body, inspect and replace the PCV as needed, check for intake leaks, keep the air filter fresh, and use good‑quality 95+ RON fuel. If it’s a PZEV variant throwing secondary air faults, the air injection valves and pump need proper diagnosis rather than “EGR cleaning”—because there isn’t an EGR to clean.

Popular questions about 2015‑Subaru‑Impreza EGR valves

Where is the EGR valve on a 2015 Subaru Impreza?
It doesn’t have one on the 2.0‑litre petrol FB20. If the goal is fixing rough idle or a check‑engine light, check the PCV, throttle body, intake leaks, MAF and, on PZEV cars, the secondary air injection system instead.

Which Subaru models actually use an EGR valve?
Subaru’s diesel EE20 engines use EGR. Many turbo direct‑injected models (e.g., FA20DIT) and later fifth‑gen Impreza (2017‑on) FB20 direct‑injected engines use cooled EGR. The 2015 Impreza 2.0‑litre port‑injected petrol does not.

Can an EGR‑style fault code appear on a 2015 Impreza?
Typical EGR flow codes (like P0401) aren’t expected on this model because there’s no EGR circuit. More common are P0410‑series (secondary air), P0171 (system too lean), or misfire codes—each pointing to different systems to test and service.