P0414 on Subaru
Secondary Air Injection System Switching Valve "A" Circuit Shorted
P0414 on Subaru vehicles indicates secondary air injection system switching valve "a" circuit shorted. Au7o has documented this code across 1 Subaru model — most commonly on WRX. 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. Typical repair costs on Subaru range from $700 to $2,200, depending on the specific model and root cause.
Common Causes of P0414
- •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)
P0414 on Subaru by Model
Subaru WRX(1 issue)
- Secondary Air Injection Pump and Switching Valve Failure Triggering CEL and Limp Mode2006-2014
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.
Looking for P0414 on a different make?
View P0414 across all makes →Frequently Asked Questions
What does P0414 mean on Subaru?▼
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. On Subaru specifically, this code is documented across 1 model.
What causes P0414 on Subaru vehicles?▼
Common causes on Subaru: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0414 on a Subaru?▼
Repair costs on Subaru range from $700 to $2,200, depending on the specific model and root cause.
Which Subaru models have P0414 documented?▼
Au7o has documented P0414 on 1 Subaru model: WRX.