Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2012IMPREZA WRX STI F4-2.5L DOHC TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSAIR INJECTIONAIR INJECTION CONTROL VALVESERVICE AND REPAIR
2012 Subaru Impreza WRX STI F4-2.5L DOHC Turbo
Air Injection Control Valve: Service and Repair
2012 Subaru Impreza WRX STI F4-2.5L DOHC TurboSECTION Service and Repair
Secondary Air Combination Valve
REMOVAL
SECONDARY AIR COMBINATION VALVE LH
1. Disconnect the ground cable from battery.
2. Remove the intercooler.
3. Disconnect the connector from the secondary air combination valve LH.
4. Disconnect the air duct A.
5. Remove the secondary air pipe LH.
6. Remove the secondary air combination valve LH.
SECONDARY AIR COMBINATION VALVE RH
1. Disconnect the ground cable from battery.
2. Remove the intercooler.
3. Remove the intake manifold.
4. Disconnect the air duct A.
5. Disconnect the secondary air pipe RH.
6. Remove the secondary air combination valve RH.
INSTALLATION
SECONDARY AIR COMBINATION VALVE LH
Install in the reverse order of removal.
NOTE: Use a new gasket.
Tightening torque:
T1: 9 N.m (0.9 kgf-m, 6.6 ft-lb)
T2: 19 N.m (1.9 kgf-m, 14.0 ft-lb)
SECONDARY AIR COMBINATION VALVE RH
Install in the reverse order of removal.
NOTE: Use a new gasket.
Tightening torque:
T1: 9 N.m (0.9 kgf-m, 6.6 ft-lb)
T2: 19 N.m (1.9 kgf-m, 14.0 ft-lb)
REMOVAL
SECONDARY AIR COMBINATION VALVE LH
1. Disconnect the ground cable from battery.
2. Remove the intercooler.
3. Disconnect the connector from the secondary air combination valve LH.
4. Disconnect the air duct A.
5. Remove the secondary air pipe LH.
6. Remove the secondary air combination valve LH.
SECONDARY AIR COMBINATION VALVE RH
1. Disconnect the ground cable from battery.
2. Remove the intercooler.
3. Remove the intake manifold.
4. Disconnect the air duct A.
5. Disconnect the secondary air pipe RH.
6. Remove the secondary air combination valve RH.
INSTALLATION
SECONDARY AIR COMBINATION VALVE LH
Install in the reverse order of removal.
NOTE: Use a new gasket.
Tightening torque:
T1: 9 N.m (0.9 kgf-m, 6.6 ft-lb)
T2: 19 N.m (1.9 kgf-m, 14.0 ft-lb)
SECONDARY AIR COMBINATION VALVE RH
Install in the reverse order of removal.
NOTE: Use a new gasket.
Tightening torque:
T1: 9 N.m (0.9 kgf-m, 6.6 ft-lb)
T2: 19 N.m (1.9 kgf-m, 14.0 ft-lb)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.