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 MANUALSSUBARU2000FORESTER L, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONDTC INDEXENGINE PERFORMANCE DTCS
2000 Subaru Forester L, Automatic
Engine Performance DTCS
2000 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 |
|---|---|
| DTC P0106 | INTAKE AIR TEMPERATURE & PRESSURE SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0106 | INTAKE MANIFOLD PRESSURE SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM - 2.2L & LEGACY 2.5L M/T |
| DTC P0107 | INTAKE AIR TEMPERATURE & PRESSURE SENSOR CIRCUIT LOW INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0107 | INTAKE MANIFOLD PRESSURE SENSOR CIRCUIT LOW INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P0108 | INTAKE AIR TEMPERATURE & PRESSURE SENSOR CIRCUIT HIGH INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0108 | INTAKE MANIFOLD PRESSURE SENSOR CIRCUIT HIGH INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P0111 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0111 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM - 2.2L & LEGACY 2.5L M/T |
| DTC P0112 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT LOW INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0112 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT LOW INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P0113 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT HIGH INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0113 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT HIGH INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P0116 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT LOW INPUT |
| DTC P0117 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT HIGH INPUT |
| DTC P0121 | THROTTLE POSITION (TP) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM (HIGH INPUT) |
| DTC P0122 | THROTTLE POSITION (TP) SENSOR CIRCUIT LOW INPUT |
| DTC P0123 | THROTTLE POSITION (TP) SENSOR CIRCUIT HIGH INPUT |
| DTC P0125 | ENGINE COOLANT TEMPERATURE TOO LOW FOR CLOSED LOOP FUEL CONTROL |
| DTC P0130 | FRONT OXYGEN SENSOR (O2S) CIRCUIT RANGE/PERFORMANCE PROBLEM - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0131 | FRONT OXYGEN SENSOR (O2S) CIRCUIT RANGE/PERFORMANCE PROBLEM (LOW INPUT) - 2.2L & LEGACY 2.5L M/T |
| DTC P0132 | FRONT OXYGEN SENSOR (O2S) CIRCUIT RANGE/PERFORMANCE PROBLEM (HIGH INPUT) - 2.2L & LEGACY 2.5L M/T |
| DTC P0133 | FRONT OXYGEN SENSOR (O2S) CIRCUIT SLOW RESPONSE |
| DTC P0136 | REAR OXYGEN SENSOR (O2S) CIRCUIT MALFUNCTION |
| DTC P0139 | REAR OXYGEN SENSOR (O2S) CIRCUIT SLOW RESPONSE |
| DTC P0141 | REAR OXYGEN SENSOR (O2S) HEATER CIRCUIT MALFUNCTION/LOW INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0141 | REAR OXYGEN SENSOR (O2S) HEATER CIRCUIT MALFUNCTION/LOW INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P0170 | FUEL TRIM MALFUNCTION - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0171 | FUEL TRIM MALFUNCTION (TOO LEAN) - 2.2L & LEGACY 2.5L M/T |
| DTC P0172 | FUEL TRIM MALFUNCTION (TOO RICH) - 2.2L & LEGACY 2.5L M/T |
| DTC P0181 | FUEL TEMPERATURE SENSOR "A" CIRCUIT RANGE/PERFORMANCE PROBLEM |
| DTC P0182 | FUEL TEMPERATURE SENSOR "A" CIRCUIT LOW INPUT |
| DTC P0183 | FUEL TEMPERATURE SENSOR "A" CIRCUIT HIGH INPUT |
| DTC P0301 | P0304: CYLINDERS NO. 1-4 MISFIRE DETECTED |
| DTC P0325 | KNOCK SENSOR (KS) CIRCUIT MALFUNCTION |
| DTC P0335 | CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT MALFUNCTION |
| DTC P0336 | CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM |
| DTC P0340 | CAMSHAFT POSITION (CMP) SENSOR CIRCUIT MALFUNCTION |
| DTC P0341 | CAMSHAFT POSITION (CMP) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM |
| DTC P0420 | CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD |
| DTC P0440 | EVAP SYSTEM MALFUNCTION |
| DTC P0442 | EVAP SYSTEM PURGE CONTROL VALVE CIRCUIT MALFUNCTION - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0443 | EVAP SYSTEM PURGE CONTROL VALVE CIRCUIT LOW INPUT |
| DTC P0446 | EVAP SYSTEM VENT CONTROL CIRCUIT LOW INPUT |
| DTC P0451 | EVAP SYSTEM PRESSURE SENSOR RANGE/PERFORMANCE PROBLEM |
| DTC P0452 | EVAP SYSTEM PRESSURE SENSOR LOW INPUT - FORESTER & IMPREZA |
| DTC P0452 | EVAP SYSTEM PRESSURE SENSOR LOW INPUT - LEGACY |
| DTC P0453 | EVAP SYSTEM PRESSURE SENSOR HIGH INPUT - FORESTER & IMPREZA |
| DTC P0453 | EVAP SYSTEM PRESSURE SENSOR HIGH INPUT - LEGACY |
| DTC P0461 | FUEL LEVEL SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM |
| DTC P0462 | FUEL LEVEL SENSOR CIRCUIT LOW INPUT |
| DTC P0463 | FUEL LEVEL SENSOR CIRCUIT HIGH INPUT |
| DTC P0480 | COOLING FAN RELAY NO. 1 CIRCUIT LOW INPUT |
| DTC P0483 | COOLING FAN FUNCTION PROBLEM |
| DTC P0500 | VEHICLE SPEED SENSOR (VSS) MALFUNCTION |
| DTC P0505 | IDLE CONTROL SYSTEM LOW INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P0506 | IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P0506 | IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED - 2.2L & LEGACY 2.5L M/T |
| DTC P0507 | IDLE CONTROL SYSTEM RPM HIGHER THAN EXPECTED |
| DTC P0601 | INTERNAL CONTROL MODULE MEMORY CHECK SUM ERROR |
| DTC P1100 | STARTER SWITCH CIRCUIT LOW INPUT |
| DTC P1101 | NEUTRAL POSITION SWITCH CIRCUIT HIGH INPUT (A/T) |
| DTC P1101 | NEUTRAL POSITION SWITCH CIRCUIT LOW INPUT (M/T) |
| DTC P1103 | ENGINE TORQUE CONTROL SIGNAL NO. 1 CIRCUIT MALFUNCTION (A/T) |
| DTC P1106 | ENGINE TORQUE CONTROL SIGNAL NO. 2 CIRCUIT MALFUNCTION (A/T) |
| DTC P1110 | ATMOSPHERIC PRESSURE SENSOR CIRCUIT LOW INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1110 | ATMOSPHERIC PRESSURE SENSOR CIRCUIT LOW INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P1111 | ATMOSPHERIC PRESSURE SENSOR CIRCUIT HIGH INPUT- EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1111 | ATMOSPHERIC PRESSURE SENSOR CIRCUIT HIGH INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P1112 | ATMOSPHERIC PRESSURE SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1112 | ATMOSPHERIC PRESSURE SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM - 2.2L & LEGACY 2.5L M/T |
| DTC P1115 | ENGINE TORQUE CONTROL CUT SIGNAL CIRCUIT HIGH INPUT (A/T) |
| DTC P1116 | ENGINE TORQUE CONTROL CUT SIGNAL CIRCUIT LOW INPUT (A/T) |
| DTC P1120 | STARTER SWITCH CIRCUIT HIGH INPUT |
| DTC P1121 | NEUTRAL POSITION SWITCH CIRCUIT LOW INPUT (A/T) |
| DTC P1121 | NEUTRAL POSITION SWITCH CIRCUIT HIGH INPUT (M/T) |
| DTC P1130 | FRONT OXYGEN SENSOR (O2S) CIRCUIT MALFUNCTION (OPEN CIRCUIT) - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1130 | FRONT OXYGEN SENSOR (O2S) CIRCUIT MALFUNCTION (OPEN CIRCUIT) - 2.2L & LEGACY 2.5L M/T |
| DTC P1131 | FRONT OXYGEN SENSOR (O2S) CIRCUIT MALFUNCTION (SHORT CIRCUIT) - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1131 | FRONT OXYGEN SENSOR (O2S) CIRCUIT MALFUNCTION (SHORT CIRCUIT) - 2.2L & LEGACY 2.5L M/T |
| DTC P1132 | FRONT OXYGEN SENSOR (O2S) HEATER CIRCUIT LOW INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1132 | FRONT OXYGEN SENSOR (O2S) HEATER CIRCUIT LOW INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P1133 | FRONT OXYGEN SENSOR (O2S) HEATER CIRCUIT HIGH INPUT |
| DTC P1134 | FRONT OXYGEN SENSOR (O2S) MICRO-COMPUTER PROBLEM - 2.2L & LEGACY 2.5L M/T |
| DTC P1139 | FRONT OXYGEN SENSOR (O2S) NO. 1 HEATER CIRCUIT RANGE/PERFORMANCE PROBLEM - 2.2L & LEGACY 2.5L M/T |
| DTC P1142 | THROTTLE POSITION (TP) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM (LOW INPUT) - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1142 | THROTTLE POSITION (TP) SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM (LOW INPUT) - 2.2L & LEGACY 2.5L M/T |
| DTC P1151 | REAR OXYGEN SENSOR (O2S) HEATER CIRCUIT HIGH INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1151 | REAR OXYGEN SENSOR (O2S) HEATER CIRCUIT HIGH INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P1207 | AIR ASSIST INJECTOR SOLENOID VALVE CIRCUIT LOW INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1208 | AIR ASSIST INJECTOR SOLENOID VALVE CIRCUIT HIGH INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1325 | KNOCK SENSOR (KS) CIRCUIT LOW INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1400 | FUEL TANK PRESSURE CONTROL SOLENOID VALVE CIRCUIT LOW INPUT |
| DTC P1420 | FUEL TANK PRESSURE CONTROL SOLENOID VALVE CIRCUIT HIGH INPUT |
| DTC P1422 | EVAP SYSTEM PURGE CONTROL VALVE CIRCUIT HIGH INPUT |
| DTC P1423 | EVAP SYSTEM VENT CONTROL HIGH INPUT |
| DTC P1442 | FUEL LEVEL SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM 2 - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1443 | EVAP SYSTEM VENT CONTROL FUNCTION PROBLEM |
| DTC P1445 | AIR ASSIST INJECTOR SOLENOID VALVE MALFUNCTION - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1490 | THERMOSTAT MALFUNCTION - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1505 | IDLE CONTROL SYSTEM CIRCUIT HIGH INPUT - 2.2L & LEGACY 2.5L M/T |
| DTC P1507 | IDLE CONTROL SYSTEM MALFUNCTION (FAIL-SAFE) - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1507 | IDLE CONTROL SYSTEM MALFUNCTION (FAIL-SAFE) - 2.2L & LEGACY 2.5L M/T |
| DTC P1510, P1512, P1514 & P1516 | IDLE AIR CONTROL (IAC) SOLENOID VALVE SIGNAL NO. 1-4 CIRCUITS LOW INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1511, P1513, P1515 & P1517 | IDLE AIR CONTROL (IAC) SOLENOID VALVE SIGNAL NO. 1-4 CIRCUITS HIGH INPUT - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1520 | RADIATOR FAN RELAY NO. 1 CIRCUIT HIGH INPUT |
| DTC P1540 | VEHICLE SPEED SENSOR (VSS) MALFUNCTION 2 - EXCEPT 2.2L & LEGACY 2.5L M/T |
| DTC P1560 | BACK-UP VOLTAGE CIRCUIT MALFUNCTION |
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.