| P0101 | QA_RLOW | MAF Sensor Circuit Range/Performance Problem |
| P0102 | QA_LOW | MAF Sensor Circuit Low Input |
| P0103 | QA_HI | MAF Sensor Circuit High Input |
| P0106 | PS_R2 | Pressure Sensor Range/Performance |
| P0107 | P_SLOW | Pressure Sensor Circuit Low Input |
| P0108 | P_SHI | Pressure Sensor Circuit High Input |
| P0116 (2) | TW_LOW | ECT Sensor Circuit Low Input |
| P0117 (3) | TW_LOW | ECT Sensor Circuit Low Input |
| P0117 (2) | TW_HI | ECT Sensor Circuit High Input |
| P0118 (3) | TW_HI | ECT Sensor Circuit High Input |
| P0121 | TH_RHI | Throttle Position (TP) Sensor Range/Performance (High Input) |
| P0122 | THV_LOW | Throttle Position (TP) Sensor Ckt (Low Input) |
| P0123 | THV_HI | Throttle Position (TP) Sensor Ckt (High Input) |
| P0125 | TW_CL | Engine Coolant Temp. Too Low For Closed Loop Control |
| P0130 | FO2_V | Front O2S Circuit Malfunction |
| P0133 | FO2_R | Front O2S Circuit Slow Response |
| P0135 | FO2H | Front O2S Heater Circuit Malfunction |
| P0136 | RO2_V | Rear O2S Circuit Malfunction |
| P0139 | RO2_R | Rear O2S Circuit Slow Response |
| P0141 | RO2H | Rear O2S Heater Circuit Malfunction |
| P0170 | FUEL | Fuel Trim Malfunction |
| P0181 | TNKT_F | Fuel Temp. Sensor "A" Circuit Range/Performance |
| P0182 | TNKT_LOW | Fuel Temp. Sensor "A" Circuit Low Input |
| P0183 | TNKT_HI | Fuel Temp. Sensor "A" Circuit High Input |
| P0261 | INJ1 | Fuel Injector Circuit Low Input No. 1 |
| P0262 | INJ1_HI | Fuel Injector Circuit High Input No. 1 |
| P0264 | INJ2 | Fuel Injector Circuit Low Input No. 2 |
| P0265 | INJ2_HI | Fuel Injector Circuit High Input No. 2 |
| P0267 | INJ3 | Fuel Injector Circuit Low Input No. 3 |
| P0268 | INJ3_HI | Fuel Injector Circuit High Input No. 3 |
| P0270 | INJ4 | Fuel Injector Circuit Low Input No. 4 |
| P0271 | INJ4_HI | Fuel Injector Circuit High Input No. 4 |
| P0301 | MIS_1 | Cylinder No. 1 Misfire Detected |
| P0302 | MIS_2 | Cylinder No. 2 Misfire Detected |
| P0303 | MIS_3 | Cylinder No. 3 Misfire Detected |
| P0304 | MIS_4 | Cylinder No. 4 Misfire Detected |
| P0325 | KNOCK | Knock Sensor (KS) Circuit Malfunction |
| P0335 | CRANK | Crankshaft Position (CKP) Sensor Malfunction |
| P0336 | CRANK_R | Crankshaft Position Sensor Range/Performance Problem |
| P0340 | CAM | Camshaft Position (CMP) Sensor Circuit Malfunction |
| P0341 | CAM_R | Camshaft Position Sensor Range/Performance Problem |
| P0400 | EGR | EGR Flow Malfunction |
| P0403 | EGRSOL | EGR Circuit Low Input |
| P0420 | CAT | CAT Efficiency Below Threshold |
| P0440 | EVAP | EVAP Emission Control System |
| P0441 | CPC_F | Incorrect EVAP Purge Flow |
| P0443 | CPC | EVAP Purge Circuit Low Input |
| P0446 | VCMSOL_LOW | EVAP Emission Control System Vent Control Low Input |
| P0451 | TNKP_F | EVAP Pressure Sensor Range/Performance Problem |
| P0452 (4) | TNKP_LOW | EVAP Pressure Sensor Low Input |
| P0452 (5) | TNKP_LOW | EVAP Pressure Sensor Low Input |
| P0453 (6) | TNKP_HI | EVAP Pressure Sensor High Input |
| P0453 (2) | TNKP_HI | EVAP Pressure Sensor High Input |
| P0461 | FLVL_R | Fuel Level Sensor Ckt Range/Performance Problem |
| P0462 | FLVL_LOW | Fuel Level Sensor Circuit Low Input |
| P0463 | FLVL_HI | Fuel Level Sensor Circuit High Input |
| P0480 | N/A | Cooling Fan Relay No. 1 Low Input |
| P0483 | N/A | Cooling Fan Function Problem |
| P0500 (3) | VSP | Vehicle Speed Sensor (VSS) Malfunction |
| P0500 (2) | VSP | Vehicle Speed Sensor (VSS) Malfunction |
| P0505 | ISC | Idle Control System Malfunction |
| P0506 | ISC_RLOW | Idle RPM Too Low |
| P0507 | ISC_RHI | Idle RPM Too High |
| P0600 | N/A | Serial Communication Link Malfunction |
| P0601 | RAM | Internal Control Module Memory Check Sum Error |
| P0703 (7) | ATBRK | Brake Switch Input Malfunction |
| P0705 (7) | ATRNG | Trans. Range Sensor Circuit Malfunction |
| P0710 (7) | ATF | Trans. Fluid Temp. Sensor Circuit Malfunction |
| P0720 (7) | ATVSP | Output Speed Sensor (VSS No. 1) Circuit Malfunction |
| P0725 (7) | ATNE | Engine Speed Input Circuit Malfunction |
| P0731 (7) | ATGR1 | Gear 1 Incorrect Ratio |
| P0732 (7) | ATGR2 | Gear 2 Incorrect Ratio |
| P0733 (7) | ATGR3 | Gear 3 Incorrect Ratio |
| P0734 (7) | ATGR4 | Gear 4 Incorrect Ratio |
| P0740 (7) | ATLU_F | Torque Converter Clutch System Malfunction |
| P0743 (7) | ATLU | Torque Converter Clutch System Electrical |
| P0748 (7) | ATPL | Pressure Control Solenoid Electrical |
| P0753 (7) | ATSFT1 | Shift Solenoid "A" Electrical |
| P0758 (7) | ATSFT2 | Shift Solenoid "B" Electrical |
| P0760 (7) | ATOVR_F | Shift Solenoid "C" Malfunction |
| P0763 (7) | ATOVR | Shift Solenoid "C" Electrical |
| P1100 | ST_SWOFF | Starter Switch Circuit Low Input |
| P1101 | N_SWOFF | Neutral Position Switch High Input (A/T) |
| P1101 | N_SW | Neutral Position Switch Ckt Malfunction (M/T) |
| P1102 | BR | Pressure Sources Switching Solenoid Valve Ckt Low Input |
| P1103 | TRQ | Engine Torque Control Signal Ckt Malfunction |
| P1104 (2) (7) | TCS_LOW | TCS Signal Circuit Malfunction |
| P1120 | ST_SWON | Starter Switch Circuit High Input |
| P1121 | N_SWON | Neutral Position Switch Low Input (A/T) |
| P1122 | BR_HI | Pressure Sources Switching Solenoid Valve Circuit High Input |
| P1124 (8) | TCS_HI | TCS Signal Circuit High Input |
| P1141 | QA_RHI | MAF Sensor Ckt Range/Performance Problem (High Input) |
| P1142 | TH_RLOW | Throttle Position Sensor Ckt Range/Performance (Low Input) |
| P1143 | PS_RLOW | Pressure Sensor Ckt Range/Performance Problem (Low Input) |
| P1144 | PS_RHI | Pressure Sensor Ckt Range/Performance Problem (High Input) |
| P1400 | PCVSOL_LO | Fuel Tank Pressure Control Solenoid Ckt Low Input |
| P1420 | PCVSOL_HI | Fuel Tank Pressure Control Solenoid Valve Ckt High Input |
| P1421 | EGRSOL_HI | EGR Circuit High Input |
| P1422 | CPC_HI | EVAP Purge Control Valve Ckt High Input |
| P1423 | VCMSOL_HI | EVAP Vent Control High Input |
| P1440 | PCV_FLOW | Fuel Tank Pressure Control System Function Problem (Low Input) |
| P1441 | PCV_FHI | Fuel Tank Pressure Control System Function (High Input) |
| P1442 | FLVL_R2 | Fuel Level Sensor Ckt Range/Performance Problem 2 |
| P1443 (9) | N/A | EVAP Vent Control Function Problem |
| P1507 | ISC_SHI | Idle Control System Malfunction (Fail-Safe) |
| P1520 | FAN_1HI | Radiator Fan Relay 1 Circuit High Input |
| P1540 | VSP_S | Vehicle Speed Sensor Malfunction 2 |
| P1700 | ATTH | TP Sensor Circuit Malfunction (A/T) |
| P1701 (7) | ATCRS | Cruise Control Set Signal Ckt Malfunction (A/T) |
| P1702 (7) | ATDIAG | A/T Diagnosis Input Signal Ckt Low Input |
| P1722 (7) | ATDIAG_HI | A/T Diagnosis Input Signal Ckt High Input |
| P1742 (7) | ATDIAG_2 | A/T Diagnosis Input Signal Ckt Malfunction |
| (1) When using Subaru Select Monitor (SSM). (2) Legacy models only. (3) Forester and Impreza models only. (4) Forester & 2.5L Impreza only. (5) Legacy & 2.2L Impreza only. (6) All except Legacy. (7) Covered in entirety in AUTOMATIC TRANSMISSION section. (8) See appropriate ANTI-LOCK BRAKE SYSTEM article in BRAKES section. (9) Impreza 2.2L models and all Legacy models. |
