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.
2018 Subaru WRX STIFACTORY OEM SERVICE PROCEDURE
Engine Control System (Diagnostics) (3 Of 4) (STI)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC P081A: Starter Disable Circuit Low
- DTC P0851: Park/Neutral Switch Input Circuit Low
- DTC P0852: Park/Neutral Switch Input Circuit High
- DTC P1160: Throttle Return Spring
- DTC P1410: Secondary Air Injection System Combination Valve Stuck Open
- DTC P1449: EVAP System Clog Detected (Air Filter)
- DTC P1451: EVAP System Clog Detected (Pipe)
- DTC P2004: TGV Control Stuck Open Bank 1
- DTC P2005: TGV Control Stuck Open Bank 2
- DTC P2006: TGV Control Stuck Closed Bank 1
- DTC P2007: TGV Control Stuck Closed Bank 2
- DTC P2008: TGV Control Circuit/Open Bank 1
- DTC P2009: TGV Control Circuit Low Bank 1
- DTC P2011: TGV Control Circuit/Open Bank 2
- DTC P2012: TGV Control Circuit Low Bank 2
- DTC P2016: TGV Position Sensor/Switch Circuit Low Bank 1
- DTC P2017: TGV Position Sensor/Switch Circuit High Bank 1
- DTC P2021: TGV Position Sensor/Switch Circuit Low Bank 2
- DTC P2022: TGV Position Sensor/Switch Circuit High Bank 2
- DTC P2088: "A" Camshaft Position Actuator Control Circuit Low Bank 1
- DTC P2089: "A" Camshaft Position Actuator Control Circuit High Bank 1
- DTC P2090: "B" Camshaft Position Actuator Control Circuit Low Bank 1
- DTC P2091: "B" Camshaft Position Actuator Control Circuit High Bank 1
- DTC P2092: "A" Camshaft Position Actuator Control Circuit Low Bank 2
- DTC P2093: "A" Camshaft Position Actuator Control Circuit High Bank 2
- DTC P2094: "B" Camshaft Position Actuator Control Circuit Low Bank 2
- DTC P2095: "B" Camshaft Position Actuator Control Circuit High Bank 2
- DTC P2096: Post Catalyst Fuel Trim System Too Lean Bank 1
- DTC P2097: Post Catalyst Fuel Trim System Too Rich Bank 1
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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