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 MANUALSSUBARU2004BAJA BASE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 140 (ENGINE (DIAGNOSTICS) (STI))
2004 Subaru Baja Base, Standard
Section 140 (ENGINE (DIAGNOSTICS) (STi))
2004 Subaru Baja Base, StandardSECTION Section 140 (ENGINE (DIAGNOSTICS) (STi))
WARNING: This page is about a different car, the 2004 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
- Basic Diagnostic Procedure
- Procedure
- DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)
- DTC P0457: Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
- DTC P0458: Evaporative Emission Control System Purge Control Valve Circuit Low
- DTC P0459: Evaporative Emission Control System Purge Control Valve Circuit High
- DTC P0461: Fuel Level Sensor Circuit Range/Performance
- DTC P0462: Fuel Level Sensor Circuit Low Input
- DTC P0463: Fuel Level Sensor Circuit High Input
- DTC P0464: Fuel Level Sensor Circuit Intermittent
- DTC P0483: Cooling Fan Rationality Check
- DTC P0502: Vehicle Speed Sensor Circuit Low Input
- DTC P0503: Vehicle Speed Sensor Intermittent/Erratic/High
- DTC P0506: Idle Control System Rpm Lower Than Expected
- DTC P0507: Idle Control System Rpm Higher Than Expected
- DTC P0512: Starter Request Circuit
- DTC P0519: Idle Control System Malfunction (Fail-Safe)
- DTC P0604: Internal Control Module Random Access Memory (Ram) Error
- DTC P0605: Internal Control Module Read Only Memory (ROM) Error
- DTC P0607: Control Module Performance
- DTC P0638: Throttle Actuator Control Range/Performance (Bank 1)
- DTC P0691: Cooling Fan 1 Control Circuit Low
- DTC P0692: Cooling Fan 1 Control Circuit High
- DTC P0851: Neutral Switch Input Circuit Low
- DTC P0852: Neutral Switch Input Circuit High
- DTC P1086: Tumble Generated Valve Position Sensor 2 Circuit Low
- DTC P1087: Tumble Generated Valve Position Sensor 2 Circuit High
- DTC P1088: Tumble Generated Valve Position Sensor 1 Circuit Low
- DTC P1089: Tumble Generated Valve Position Sensor 1 Circuit High
- DTC P1090: Tumble Generated Valve System 1 (Valve Open)
- DTC P1091: Tumble Generated Valve System 1 (Valve Close)
- DTC P1092: Tumble Generated Valve System 2 (Valve Open)
- DTC P1093: Tumble Generated Valve System 2 (Valve Close)
- DTC P1094: Tumble Generated Valve Signal 1 Circuit Malfunction (Open)
- DTC P1095: Tumble Generated Valve Signal 1 Circuit Malfunction (Short)
- DTC P1096: Tumble Generated Valve Signal 2 Circuit Malfunction (Open)
- DTC P1097: Tumble Generated Valve Signal 2 Circuit Malfunction (Short)
- DTC P1110: Atmospheric Pressure Sensor Circuit Malfunction (Low Input)
- DTC P1111: Atmospheric Pressure Sensor Circuit Malfunction (High Input)
- DTC P1152: O2 Sensor Circuit Range/Performance (Low) (Bank1 Sensor1)
- DTC P1153: O2 Sensor Circuit Range/Performance (High) (Bank1 Sensor1)
- DTC P1160: Return Spring Failure
- DTC P1400: Fuel Tank Pressure Control Solenoid Valve Circuit Low
- DTC P1420: Fuel Tank Pressure Control Sol. Valve Circuit High
- DTC P1443: Vent Control Solenoid Valve Function Problem
- DTC P1446: Fuel Tank Sensor Control Valve Circuit Low
- DTC P1447: Fuel Tank Sensor Control Valve Circuit High
- DTC P1448: Fuel Tank Sensor Control Valve Range/Performance
- DTC P1491: Positive Crankcase Ventilation (Blow-By) Function Problem
- DTC P1518: Starter Switch Circuit Low Input
- DTC P1560: Back-Up Voltage Circuit Malfunction
- DTC P2088: OCV Solenoid Valve Signal A Circuit Open (Bank 1)
- DTC P2089: OCV Solenoid Valve Signal A Circuit Short (Bank 1)
- DTC P2092: OCV Solenoid Valve Signal A Circuit Open (Bank 2)
- DTC P2093: OCV Solenoid Valve Signal A Circuit Short (Bank 2)
- DTC P2096: Post Catalyst Fuel Trim System Too Lean Bank 1
- DTC P2097: Post Catalyst Fuel Trim System Too Rich Bank 1
- DTC P2101: Throttle Actuator Control Motor Circuit Range/Performance
- DTC P2102: Throttle Actuator Control Motor Circuit Low
- DTC P2103: Throttle Actuator Control Motor Circuit High
- DTC P2109: Throttle/Pedal Position Sensor A Minimum Stop Performance
- DTC P2122: Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input
- DTC P2123: Throttle/Pedal Position Sensor/Switch "D" Circuit High Input
- DTC P2127: Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input
- DTC P2128: Throttle/Pedal Position Sensor/Switch "E" Circuit High Input
- DTC P2135: Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Rationality
- DTC P2138: Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Rationality
- Check List for Interview
- General Description
- Electrical Components Location
- Engine Control Module (ECM) I/O Signal
- Engine Condition Data
- Data Link Connector
- OBD-II General Scan Tool
- Subaru Select Monitor
- Operation
- How To Use SUBARU Select Monitor
- Read Diagnostic Trouble Code (DTC) For Engine. (Normal Mode)
- Read Diagnostic Trouble Code (DTC) For Engine. (OBD Mode)
- Read Current Data For Engine. (Normal Mode)
- Read Current Data For Engine. (OBD Mode)
- Read Freeze Frame Data For Engine. (OBD Mode)
- Led Operation Mode For Engine
- Operation
- Read Diagnostic Trouble Code (DTC)
- Inspection Mode
- Drive Cycle
- Clear Memory Mode
- Compulsory Valve Operation Check Mode
- Malfunction Indicator Light
- Diagnostics for Engine Starting Failure
- List of Diagnostic Trouble Code (DTC)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC P0011: "A" Camshaft Position-Timing Over-Advanced Or System Performance (Bank 1)
- DTC P0021: "A" Camshaft Position-Timing Over-Advanced Or System Performance (Bank 2)
- DTC P0030: Ho2S Heater Control Circuit (Bank 1 Sensor 1)
- DTC P0031: Ho2S Heater Control Circuit Low (Bank 1 Sensor 1)
- DTC P0032: Ho2S Heater Control Circuit High (Bank 1 Sensor 1)
- DTC P0037: Ho2S Heater Control Circuit Low (Bank 1 Sensor 2)
- DTC P0038: Ho2S Heater Control Circuit High (Bank 1 Sensor 2)
- DTC P0068: Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance
- DTC P0101: Mass Or Volume Air Flow Circuit Range/Performance
- DTC P0102: Mass Or Volume Air Flow Circuit Low Input
- DTC P0103: Mass Or Volume Air Flow Circuit High Input
- DTC P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
- DTC P0108: Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- DTC P0111: Intake Air Temperature Circuit Range/Performance
- DTC P0112: Intake Air Temperature Circuit Low Input
- DTC P0113: Intake Air Temperature Circuit High Input
- DTC P0117: Engine Coolant Temperature Circuit Low Input
- DTC P0118: Engine Coolant Temperature Circuit High Input
- DTC P0122: Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input
- DTC P0123: Throttle/Pedal Position Sensor/Switch "A" Circuit High Input
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
- DTC P0129: Atmospheric Pressure Sensor Circuit Range/Performance
- DTC P0131: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
- DTC P0132: O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
- DTC P0133: O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
- DTC P0134: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
- DTC P0137: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
- DTC P0138: O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
- DTC P0139: O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
- DTC P0171: System Too Lean (Bank 1)
- DTC P0172: System Too Rich (Bank 1)
- DTC P0181: Fuel Temperature Sensor "A" Circuit Range/Performance
- DTC P0182: Fuel Temperature Sensor "A" Circuit Low Input
- DTC P0183: Fuel Temperature Sensor "A" Circuit High Input
- DTC P0222: Throttle/Pedal Position Sensor/Switch "B" Circuit Low Input
- DTC P0223: Throttle/Pedal Position Sensor/Switch "B" Circuit High Input
- DTC P0230: Fuel Pump Primary Circuit
- DTC P0244: Turbo/Super Charger WASTEGATE Solenoid "A" Range/Performance
- DTC P0245: Turbo/Super Charger WASTEGATE Solenoid "A" Low
- DTC P0246: Turbo/Super Charger WASTEGATE Solenoid "A" High
- DTC P0301: Cylinder 1 Misfire Detected
- DTC P0302: Cylinder 2 Misfire Detected
- DTC P0303: Cylinder 3 Misfire Detected
- DTC P0304: Cylinder 4 Misfire Detected
- DTC P0327: Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
- DTC P0328: Knock Sensor 1 Circuit High Input (Bank 1 Or Single Sensor)
- DTC P0335: Crankshaft Position Sensor "A" Circuit
- DTC P0336: Crankshaft Position Sensor "A" Circuit Range/Performance
- DTC P0340: Camshaft Position Sensor "A" Circuit (Bank 1 Or Single Sensor)
- DTC P0345: Camshaft Position Sensor "A" Circuit (Bank 2)
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0442: Evaporative Emission Control System Leak Detected (Small Leak)
- DTC P0447: Evaporative Emission Control System Vent Control Circuit Open
- DTC P0448: Evaporative Emission Control System Vent Control Circuit Shorted
- DTC P0451: Evaporative Emission Control System Pressure Sensor Range/Performance
- DTC P0452: Evaporative Emission Control System Pressure Sensor Low Input
- DTC P0453: Evaporative Emission Control System Pressure Sensor High Input
- General Diagnostic Table
RENDER: 1.0x
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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.