P0414 on 2006-2014 Subaru WRX — Secondary Air Injection System Switching Valve "A" Circuit Shorted
1 vehicles · 1 makes · $700-$2,200 repair
How to diagnose and fix P0414: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Subaru WRX · 2006–2014
Turbo EJ255/EJ257 WRX models equipped with the secondary air injection system commonly develop failures of the air pump, pressure sensor, or the air switching valves. Moisture intrusion and corrosion can cause the valves to stick or the pump to seize, which sets emissions faults and on many cars can reduce power or force a limp-home condition. Owners typically report a check-engine light shortly after cold start, often with rough cold operation or an audible pump noise before failure.
Common Symptoms
- check engine light after cold start
- reduced power or limp mode
- loud buzzing or whining from air pump area
- rough cold start
- failed emissions inspection
How to Fix
Diagnosis usually starts with scanning for secondary air system codes and commanding the pump/valves with a capable scan tool. Repair typically involves replacing one or both air switching valves, the pump, and sometimes the pressure sensor or related hoses; some owners also inspect for water entry and update gaskets/hoses during repair. Because access is tight on turbo models, labor can be significant, and clearing codes without fixing the root cause usually results in repeat faults.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Subaru 14828AA060 Secondary Air Pump Assembly
early pump branch only after bidirectional testing proves the pump itself failed Fitment/availability: 2007 WRX and 2007 STI turbo secondary-air system; also cataloged for 2007-2008 Forester XT, confirm VIN Fitment/availability: Ships di…
- Genuine Subaru 14828AA050 Secondary Air Injection Pump Assembly
later pump branch only after bidirectional testing proves the pump itself failed Fitment/availability: 2008-2014 WRX and 2008-2021 STI; this canonical card uses it only for the 2008-2014 WRX/STI overlap, confirm VIN Fitment/availability:…
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Owner tips & cautions
- TipUse an OBD-II scanner that can read Subaru-specific pending/history codes and active test the air pump/valves before buying parts.
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P0414 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0414 mean?
P0414 stands for "Secondary Air Injection System Switching Valve "A" Circuit Shorted." This code means the PCM detected a short in the control circuit for secondary air injection switching valve 'A'. The secondary air system injects fresh air into the exhaust on cold starts to speed catalytic converter warm-up and lower emissions. A shorted circuit prevents proper valve control and mainly impacts cold-start emissions performance. It typically illuminates the check engine light with minimal driveability effect.
What are the most common causes of P0414?
The most common causes of P0414 are: Faulty secondary air injection switching valve, Wiring shorted to power or ground, Damaged or chafed wiring harness, Corroded or shorted connector terminals, Internal valve solenoid short, Failing PCM (less common). The specific cause varies by vehicle.
How much does it cost to fix P0414?
Repair costs for P0414 range from $700 to $2,200, depending on the vehicle and root cause.
Which vehicles are affected by P0414?
Au7o has documented P0414 across 1 vehicle models from 1 manufacturers: Subaru.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.