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
Inspection Mode: Procedure: Notes
Perform the diagnosis shown in the following DTC table.
When performing the diagnosis not listed in "List of Diagnostic Trouble Code (DTC)", refer to the item on the drive cycle. Ref. to ENGINE (DIAGNOSTICS) (STI)>Drive Cycle .
| DTC | Item | Condition |
|---|---|---|
| B1570 | ANTENNA | - |
| B1571 | REFERENCE CODE INCOMPATIBILITY | - |
| B1572 | IMM CIRCUIT EXCEPT ANTENNA CIRCUIT | - |
| B1574 | KEY COMMUNICATION | - |
| B1575 | INCORRECT IMMOBILIZER KEY | - |
| B1576 | EGI CONTROL MODULE EEPROM | - |
| B1577 | IMM CONTROL MODULE EEPROM | - |
| B1578 | METER | - |
| P0031 | A/F/O2 HEATER CONTROL CIRCUIT LOW BANK 1 SENSOR 1 | - |
| P0032 | A/F/O2 HEATER CONTROL CIRCUIT HIGH BANK 1 SENSOR 1 | - |
| P0037 | A/F/O2 HEATER CONTROL CIRCUIT LOW BANK 1 SENSOR 2 | - |
| P0038 | A/F/O2 HEATER CONTROL CIRCUIT HIGH BANK 1 SENSOR 2 | - |
| P0072 | AMBIENT AIR TEMPERATURE SENSOR CIRCUIT "A" LOW | - |
| P0073 | AMBIENT AIR TEMPERATURE SENSOR CIRCUIT "A" HIGH | - |
| P0102 | MASS OR VOLUME AIR FLOW SENSOR "A" CIRCUIT LOW | - |
| P0103 | MASS OR VOLUME AIR FLOW SENSOR "A" CIRCUIT HIGH | - |
| P0107 | MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE SENSOR CIRCUIT LOW | - |
| P0108 | MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE SENSOR CIRCUIT HIGH | - |
| P0112 | INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT LOW BANK 1 | - |
| P0113 | INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT HIGH BANK 1 | - |
| P0117 | ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT LOW | - |
| P0118 | ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT HIGH | - |
| P0122 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT LOW | - |
| P0123 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT HIGH | - |
| P0131 | A/F/O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 1 | - |
| P0132 | A/F/O2 SENSOR CIRCUIT HIGH VOLTAGE BANK 1 SENSOR 1 | - |
| P0201 | CYLINDER 1 INJECTOR "A" CIRCUIT | - |
| P0202 | CYLINDER 2 INJECTOR "A" CIRCUIT | - |
| P0203 | CYLINDER 3 INJECTOR "A" CIRCUIT | - |
| P0204 | CYLINDER 4 INJECTOR "A" CIRCUIT | - |
| P0222 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT LOW | - |
| P0223 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT HIGH | - |
| P0230 | FUEL PUMP PRIMARY CIRCUIT | - |
| P0245 | TURBOCHARGER/SUPERCHARGER WASTEGATE SOLENOID "A" LOW | - |
| P0327 | KNOCK/COMBUSTION VIBRATION SENSOR 1 CIRCUIT LOW BANK 1 OR SINGLE SENSOR | - |
| P0328 | KNOCK/COMBUSTION VIBRATION SENSOR 1 CIRCUIT HIGH BANK 1 OR SINGLE SENSOR | - |
| P0335 | CRANKSHAFT POSITION SENSOR "A" CIRCUIT | - |
| P0336 | CRANKSHAFT POSITION SENSOR "A" CIRCUIT RANGE/PERFORMANCE | - |
| P0340 | CAMSHAFT POSITION SENSOR "A" CIRCUIT BANK 1 OR SINGLE SENSOR | - |
| P0341 | CAMSHAFT POSITION SENSOR "A" CIRCUIT RANGE/PERFORMANCE BANK 1 OR SINGLE SENSOR | - |
| P0345 | CAMSHAFT POSITION SENSOR "A" CIRCUIT BANK 2 | - |
| P0346 | CAMSHAFT POSITION SENSOR "A" CIRCUIT RANGE/PERFORMANCE BANK 2 | - |
| P0351 | IGNITION COIL "A" PRIMARY CONTROL CIRCUIT/OPEN | - |
| P0352 | IGNITION COIL "B" PRIMARY CONTROL CIRCUIT/OPEN | - |
| P0353 | IGNITION COIL "C" PRIMARY CONTROL CIRCUIT/OPEN | - |
| P0354 | IGNITION COIL "D" PRIMARY CONTROL CIRCUIT/OPEN | - |
| P0365 | CAMSHAFT POSITION SENSOR "B" CIRCUIT BANK 1 | - |
| P0366 | CAMSHAFT POSITION SENSOR "B" CIRCUIT RANGE/PERFORMANCE BANK 1 | - |
| P0390 | CAMSHAFT POSITION SENSOR "B" CIRCUIT BANK 2 | - |
| P0391 | CAMSHAFT POSITION SENSOR "B" CIRCUIT RANGE/PERFORMANCE BANK 2 | - |
| P0413 | SECONDARY AIR SYSTEM SWITCHING VALVE "A" CIRCUIT OPEN | - |
| P0416 | SECONDARY AIR SYSTEM SWITCHING VALVE "B" CIRCUIT OPEN | - |
| P0452 | EVAP SYSTEM (CPC) PRESSURE SENSOR/SWITCH CIRCUIT LOW | - |
| P0453 | EVAP SYSTEM (CPC) PRESSURE SENSOR/SWITCH CIRCUIT HIGH | - |
| P0458 | EVAP SYSTEM (CPC) PURGE CONTROL VALVE "A" CIRCUIT LOW | - |
| P0462 | FUEL LEVEL SENSOR "A" CIRCUIT LOW | - |
| P0463 | FUEL LEVEL SENSOR "A" CIRCUIT HIGH | - |
| P04AC | EVAP SYSTEM (CPC) PURGE CONTROL VALVE "B" CIRCUIT LOW | - |
| P04DB | CRANKCASE VENTILATION SYSTEM (PCV) DISCONNECTED | - |
| P0512 | STARTER (SWITCH) REQUEST CIRCUIT | - |
| P0560 | SYSTEM VOLTAGE | - |
| P0604 | INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERROR | - |
| P0605 | INTERNAL CONTROL MODULE READ ONLY MEMORY (ROM) ERROR | - |
| P0606 | CONTROL MODULE PROCESSOR | - |
| P060A | INTERNAL CONTROL MODULE MONITORING PROCESSOR PERFORMANCE | - |
| P060B | INTERNAL CONTROL MODULE A/D PROCESSING PERFORMANCE | - |
| P0616 | STARTER RELAY "A" CIRCUIT LOW | - |
| P0617 | STARTER RELAY "A" CIRCUIT HIGH | - |
| P062F | INTERNAL CONTROL MODULE EEPROM ERROR | - |
| P0685 | ECM/PCM POWER RELAY CONTROL CIRCUIT/OPEN | - |
| P081A | STARTER DISABLE CIRCUIT LOW | - |
| P1160 | THROTTLE RETURN SPRING | - |
| P2008 | TGV CONTROL CIRCUIT/OPEN BANK 1 | - |
| P2009 | TGV CONTROL CIRCUIT LOW BANK 1 | - |
| P2011 | TGV CONTROL CIRCUIT/OPEN BANK 2 | - |
| P2012 | TGV CONTROL CIRCUIT LOW BANK 2 | - |
| P2016 | TGV POSITION SENSOR/SWITCH CIRCUIT LOW BANK 1 | - |
| P2017 | TGV POSITION SENSOR/SWITCH CIRCUIT HIGH BANK 1 | - |
| P2021 | TGV POSITION SENSOR/SWITCH CIRCUIT LOW BANK 2 | - |
| P2022 | TGV POSITION SENSOR/SWITCH CIRCUIT HIGH BANK 2 | - |
| P2088 | "A" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT LOW BANK 1 | - |
| P2089 | "A" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT HIGH BANK 1 | - |
| P2090 | "B" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT LOW BANK 1 | - |
| P2091 | "B" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT HIGH BANK 1 | - |
| P2092 | "A" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT LOW BANK 2 | - |
| P2093 | "A" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT HIGH BANK 2 | - |
| P2094 | "B" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT LOW BANK 2 | - |
| P2095 | "B" CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT HIGH BANK 2 | - |
| P2101 | THROTTLE ACTUATOR "A" CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE | - |
| P2102 | THROTTLE ACTUATOR "A" CONTROL MOTOR CIRCUIT LOW | - |
| P2103 | THROTTLE ACTUATOR "A" CONTROL MOTOR CIRCUIT HIGH | - |
| P2109 | THROTTLE/PEDAL POSITION SENSOR "A" MINIMUM STOP PERFORMANCE | - |
| P2119 | THROTTLE ACTUATOR "A" CONTROL THROTTLE BODY RANGE/PERFORMANCE | - |
| P2122 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT LOW | - |
| P2123 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT HIGH | - |
| P2127 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT LOW | - |
| P2128 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT HIGH | - |
| P2135 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "A"/"B" VOLTAGE CORRELATION | - |
| P2138 | THROTTLE/PEDAL POSITION SENSOR/SWITCH "D"/"E" VOLTAGE CORRELATION | - |
| P2257 | SECONDARY AIR SYSTEM CONTROL "A" CIRCUIT LOW | - |
| P2401 | EVAP SYSTEM LEAK DETECTION PUMP CONTROL CIRCUIT LOW | - |
| P2419 | EVAP SYSTEM SWITCHING VALVE CONTROL CIRCUIT LOW | - |
| P2432 | SECONDARY AIR SYSTEM AIR FLOW/PRESSURE SENSOR CIRCUIT LOW BANK 1 | - |
| P2433 | SECONDARY AIR SYSTEM AIR FLOW/PRESSURE SENSOR CIRCUIT HIGH BANK 1 | - |
| P2444 | SECONDARY AIR SYSTEM PUMP STUCK ON BANK 1 | - |
| P2530 | IGNITION SWITCH RUN POSITION CIRCUIT | - |
| U0073 | CONTROL MODULE COMMUNICATION BUS OFF | - |
| U0101 | LOST COMMUNICATION WITH TCM | - |
| U0122 | LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE | - |
| U0155 | LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE | - |
| U0402 | INVALID DATA RECEIVED FROM TCM | - |
| U0416 | INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE | - |
| U0423 | INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE | - |
Factory Service Tools
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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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