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 MANUALSSUBARU1998FORESTER L, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXENGINE PERFORMANCE DTCS
1998 Subaru Forester L, Automatic
Engine Performance DTCS
1998 Subaru Forester L, AutomaticSECTION Engine Performance DTCS
NOTE:
Retrieval of some diagnostic codes may require the use of special OEM tester or flash method using instrument cluster indicator. For procedures/testing of codes not shown below, refer to appropriate system article.
ENGINE PERFORMANCE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| P0101 | MAF Sensor Circuit Range/Performance Problem |
| P0102 | MAF Sensor Circuit Low Input |
| P0103 | MAF Sensor Circuit High Input |
| P0106 | Pressure Sensor Range/Performance |
| P0107 | Pressure Sensor Circuit Low Input |
| P0108 | Pressure Sensor Circuit High Input |
| P0116 | ECT Sensor Circuit Low Input (Legacy models only) |
| P0117 | ECT Sensor Circuit Low Input (Forester and Impreza models only) |
| P0117 | ECT Sensor Circuit High Input (Legacy models only) |
| P0118 | ECT Sensor Circuit High Input (Forester and Impreza models only) |
| P0121 | Throttle Position (TP) Sensor Range/Performance (High Input) |
| P0122 | Throttle Position (TP) Sensor Ckt (Low Input) |
| P0123 | Throttle Position (TP) Sensor Ckt (High Input) |
| P0125 | Engine Coolant Temp. Too Low For Closed Loop Control |
| P0130 | Front O2S Circuit Malfunction |
| P0133 | Front O2S Circuit Slow Response |
| P0135 | Front O2S Heater Circuit Malfunction |
| P0136 | Rear O2S Circuit Malfunction |
| P0139 | Rear O2S Circuit Slow Response |
| P0141 | Rear O2S Heater Circuit Malfunction |
| P0170 | Fuel Trim Malfunction |
| P0181 | Fuel Temp. Sensor "A" Circuit Range/Performance |
| P0182 | Fuel Temp. Sensor "A" Circuit Low Input |
| P0183 | Fuel Temp. Sensor "A" Circuit High Input |
| P0261 | Fuel Injector Circuit Low Input No. 1 |
| P0262 | Fuel Injector Circuit High Input No. 1 |
| P0264 | Fuel Injector Circuit Low Input No. 2 |
| P0265 | Fuel Injector Circuit High Input No. 2 |
| P0267 | Fuel Injector Circuit Low Input No. 3 |
| P0268 | Fuel Injector Circuit High Input No. 3 |
| P0270 | Fuel Injector Circuit Low Input No. 4 |
| P0271 | Fuel Injector Circuit High Input No. 4 |
| P0301 | Cylinder No. 1 Misfire Detected |
| P0302 | Cylinder No. 2 Misfire Detected |
| P0303 | Cylinder No. 3 Misfire Detected |
| P0304 | Cylinder No. 4 Misfire Detected |
| P0325 | Knock Sensor (KS) Circuit Malfunction |
| P0335 | Crankshaft Position (CKP) Sensor Malfunction |
| P0336 | Crankshaft Position Sensor Range/Performance Problem |
| P0340 | Camshaft Position (CMP) Sensor Circuit Malfunction |
| P0341 | Camshaft Position Sensor Range/Performance Problem |
| P0400 | EGR Flow Malfunction |
| P0403 | EGR Circuit Low Input |
| P0420 | CAT Efficiency Below Threshold |
| P0440 | EVAP Emission Control System |
| P0441 | Incorrect EVAP Purge Flow |
| P0443 | EVAP Purge Circuit Low Input |
| P0446 | EVAP Emission Control System Vent Control Low Input |
| P0451 | EVAP Pressure Sensor Range/Performance Problem |
| P0452 | EVAP Pressure Sensor Low Input (Forester & 2.5L Impreza only) |
| P0452 | EVAP Pressure Sensor Low Input (Legacy & 2.2L Impreza only) |
| P0453 | EVAP Pressure Sensor High Input (All except Legacy) |
| P0453 | EVAP Pressure Sensor High Input (Legacy models only) |
| P0461 | Fuel Level Sensor Ckt Range/Performance Problem |
| P0462 | Fuel Level Sensor Circuit Low Input |
| P0463 | Fuel Level Sensor Circuit High Input |
| P0480 | Cooling Fan Relay No. 1 Low Input |
| P0483 | Cooling Fan Function Problem |
| P0500 | Vehicle Speed Sensor (VSS) Malfunction (Forester and Impreza models only) |
| P0500 | Vehicle Speed Sensor (VSS) Malfunction (Legacy models only) |
| P0505 | Idle Control System Malfunction |
| P0506 | Idle RPM Too Low |
| P0507 | Idle RPM Too High |
| P0600 | Serial Communication Link Malfunction |
| P0601 | Internal Control Module Memory Check Sum Error |
| P1100 | Starter Switch Circuit Low Input |
| P1101 | Neutral Position Switch High Input (A/T) |
| P1101 | Neutral Position Switch Ckt Malfunction (M/T) |
| P1102 | Pressure Sources Switching Solenoid Valve Ckt Low Input |
| P1103 | Engine Torque Control Signal Ckt Malfunction |
| P1120 | Starter Switch Circuit High Input |
| P1121 | Neutral Position Switch Low Input (A/T) |
| P1122 | Pressure Sources Switching Solenoid Valve Circuit High Input |
| P1141 | MAF Sensor Ckt Range/Performance Problem (High Input) |
| P1142 | Throttle Position Sensor Ckt Range/Performance (Low Input) |
| P1143 | Pressure Sensor Ckt Range/Performance Problem (Low Input) |
| P1144 | Pressure Sensor Ckt Range/Performance Problem (High Input) |
| P1400 | Fuel Tank Pressure Control Solenoid Ckt Low Input |
| P1420 | Fuel Tank Pressure Control Solenoid Valve Ckt High Input |
| P1421 | EGR Circuit High Input |
| P1422 | EVAP Purge Control Valve Ckt High Input |
| P1423 | EVAP Vent Control High Input |
| P1440 | Fuel Tank Pressure Control System Function Problem (Low Input) |
| P1441 | Fuel Tank Pressure Control System Function (High Input) |
| P1442 | Fuel Level Sensor Ckt Range/Performance Problem 2 |
| P1443 | EVAP Vent Control Function Problem (Impreza 2.2L models and all Legacy models) |
| P1507 | Idle Control System Malfunction (Fail-Safe) |
| P1520 | Radiator Fan Relay 1 Circuit High Input |
| P1540 | Vehicle Speed Sensor Malfunction 2 |
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.