2003 Subaru Baja AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

SUBARU DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION CHART

Code No. (1) Circuit Affected
P0030 (2) Front Heated Oxygen Sensor (HO2S) Control Circuit Malfunction
P0030 (3) Front Heated Oxygen Sensor (HO2S) Control Circuit Malfunction
P0031  Front Heated Oxygen Sensor (HO2S) Heater Circuit Low Input
P0032  Front HO2S Heater Circuit High Input
P0037  Rear HO2S Heater Circuit Malfunction
P0038  Rear HO2S Heater Circuit High Output
P0065  Air Assist Injector Solenoid Valve Circuit Malfunction
P0066  Air Assist Injector Solenoid Valve Circuit Low Input
P0067  Air Assist Injector Solenoid Valve Circuit High Input
P0068 Intake Manifold Barometric Pressure Circuit Range/Performance Problem
P0107 (2) Intake Air Temperature & Pressure Sensor Circuit Low Input
P0107 (3) Intake Manifold Pressure Sensor Circuit Low Input
P0108 (2) Intake Air Temperature & Pressure Sensor Circuit High Input
P0108 (3) Intake Manifold Pressure Sensor Circuit High Input
P0111  Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem
P0112  Intake Air Temperature (IAT) Sensor Circuit Low Input
P0113  Intake Air Temperature (IAT) Sensor Circuit High Input
P0117  Engine Coolant Temperature (ECT) Sensor Circuit Low Input
P0118  Engine Coolant Temperature (ECT) Sensor Circuit High Input
P0121 (2) Throttle Position (TP) Sensor Circuit Range/Performance Problem (High Input)
P0121 (3) Throttle Position (TP) Sensor Circuit Range/Performance Problem (High Input)
P0122  Throttle Position (TP) Sensor Circuit Low Input
P0123  Throttle Position (TP) Sensor Circuit High Input
P0125  Engine Coolant Temperature Too Low For Closed Loop Fuel Control
P0128  Thermostat Malfunction
P0129  Barometric Pressure Too Low
P0130  Front HO2S Circuit Range/Performance Problem
P0131  Front HO2S Circuit Range/Performance Problem (Low Input)
P0132  Front HO2S Circuit Range/Performance Problem (High Input)
P0133  Front HO2S Circuit Slow Response
P0134  Front HO2S Circuit No Activity Detected
P0137  Rear HO2S Circuit Low Input
P0138  Rear HO2S Circuit High Input
P0139  Rear HO2S Circuit Slow Response
P0171 (2) Fuel Trim Malfunction (Too Lean)
P0171 (3) Fuel Trim Malfunction (Too Lean)
P0172 (2) Fuel Trim Malfunction (Too Rich)
P0172 (3) Fuel Trim Malfunction (Too Rich)
P0181  Fuel Temperature Sensor "A" Circuit Range/Performance Problem
P0182  Fuel Temperature Sensor "A" Circuit Low Input
P0183  Fuel Temperature Sensor "A" Circuit High Input
P0301  Cylinder No. 1 Misfire Detected
P0302  Cylinder No. 2 Misfire Detected
P0303  Cylinder No. 3 Misfire Detected
P0304  Cylinder No. 4 Misfire Detected
P0327  Knock Sensor (KS) Circuit Low Input
P0328  Knock Sensor (KS) Circuit High Input
P0335  Crankshaft Position Sensor Circuit Malfunction
P0336  Crankshaft Position (CKP) Sensor Circuit Range/Performance Problem
P0340  Camshaft Position (CMP) Sensor Circuit Malfunction
P0341  Camshaft Position (CMP) Sensor Circuit Range/Performance Problem
P0400 (2) Exhaust Gas Recirculation Flow Problem
P0420  Catalyst System Efficiency Below Threshold
P0442  EVAP System Purge Control Valve Circuit Malfunction
P0447  EVAP System Vent Control Circuit Low Input
P0448  EVAP System Vent Control Circuit High Input
P0451  EVAP System Pressure Sensor Range/Performance Problem
P0452  EVAP System Pressure Sensor Low Input
P0453 (2) EVAP System Pressure Sensor High Input
P0453 (3) EVAP System Pressure Sensor High Input
P0456  EVAP System Malfunction
P0457  EVAP System Leak Detected (Fuel Cap Loose/Off)
P0458  EVAP System Purge Control Valve Circuit Low Input
P0459  EVAP System Purge Control Valve Circuit High Input
P0461  Fuel Level Sensor Circuit Range/Performance Problem
P0462 (2) Fuel Level Sensor Circuit Low Input
P0462 (3) Fuel Level Sensor Circuit Low Input
P0463 (2) Fuel Level Sensor Circuit High Input
P0463 (3) Fuel Level Sensor Circuit High Input
P0464  Fuel Level Sensor Circuit Intermittent Input
P0483  Cooling Fan Function Problem
P0502  Vehicle Speed Sensor Circuit Low Input
P0503 (2) Vehicle Speed Sensor Intermittent/Erratic/High
P0503 (3) Vehicle Speed Sensor Intermittent/Erratic/High
P0506  Idle Control System RPM Lower Than Expected
P0507  Idle Control System RPM Higher Than Expected
P0512  Starter Switch Circuit High Input
P0519  Idle Air Control Circuit System Performance
P0565 (2) Cruise Control ON Signal
P0565 (3) Cruise Control ON Signal
P0604  Internal Control Module Memory Check Sum Error
P0691 (2) Cooling Fan 1 Control Circuit Low Input
P0691 (3) Cooling Fan 1 Control Circuit Low Input
P0692 (2) Cooling Fan 1 Control Circuit High Input
P0692 (3) Cooling Fan 1 Control Circuit High Input
P0703 (4) Brake Switch Input Malfunction (A/T)
P0705(4) Transmission Range Sensor Circuit Malfunction (A/T)
P0710 (4) Transmission Fluid Temperature Sensor Circuit Malfunction (A/T)
P0716 (4) Input/Turbine Speed Sensor Circuit Range/Performance Problem
P0720(4) Output Speed Sensor (VSS No. 2) Circuit Malfunction (A/T)
P0726(4) Engine Speed Input Circuit Range/Performance
P0731 (4) Gear 1 Incorrect Ratio (A/T)
P0732 (4) Gear 2 Incorrect Ratio (A/T)
P0733 (4) Gear 3 Incorrect Ratio (A/T)
P0734 (4) Gear 4 Incorrect Ratio (A/T)
P0741 (4) Torque Converter Clutch Circuit Performance Or Stuck Off (A/T)
P0743 (4) Torque Converter Clutch System (Lock-Up Duty Solenoid) Electrical (A/T)
P0748 (4) Pressure Control Solenoid (Line Pressure Duty Solenoid) Electrical (A/T)
P0753 (4) Shift Solenoid "A" (No. 1) Electrical (A/T)
P0758 (4) Shift Solenoid "B" (No. 2) Electrical (A/T)
P0771 Shift Solenoid "E" Performance Or Stuck Off
P0778 (4) 2-4 Brake Pressure Control Solenoid Valve Circuit Malfunction (A/T)
P0785 (4) 2-4 Brake Timing Control Solenoid Valve Circuit Malfunction (A/T)
P0851 (5) Neutral Switch Input Circuit Low
P0851 (6) Neutral Switch Input Circuit Low
P0852 (5) Neutral Switch Input Circuit High
P0852 (6) Neutral Switch Input Circuit High
P0864  TCM Communication Circuit Range/Performance
P0865 (2) TCM Communication Circuit Low Input
P0865 (3) TCM Communication Circuit Low Input
P0866 (2) TCM Communication Circuit High Input
P0866 (3) TCM Communication Circuit High Input
P1110  Atmospheric Pressure Sensor Circuit Low Input
P1111  Atmospheric Pressure Sensor Circuit High Input
P1134  Front HO2S Micro-Computer Problem
P1137  Front HO2S Circuit Range/Performance Problem
P1400  Fuel Tank Pressure Control Solenoid Valve Circuit Low Input
P1420  Fuel Tank Pressure Control Solenoid Valve Circuit High Input
P1443  Vent Control Solenoid Valve Function Problem
P1446  Fuel Tank Sensor Control Valve Circuit Low Input
P1447  Fuel Tank Sensor Control Valve Circuit High
P1448  Fuel Tank Sensor Control Valve Range/Performance Problem
P1492 (2) EGR Solenoid Valve Signal 1 Circuit Low Input
P1493 (2) EGR Solenoid Valve Signal 1 Circuit High Input
P1494 (2) EGR Solenoid Valve Signal 2 Circuit Low Input
P1495 (2) EGR Solenoid Valve Signal 2 Circuit Malfunction High Input
P1496 (2) EGR Solenoid Valve Signal 3 Circuit Low Input
P1497 (2) EGR Solenoid Valve Signal 3 Circuit High Input
P1498 (2) EGR Solenoid Valve Signal 4 Circuit Low Input
P1499 (2) EGR Solenoid Valve Signal 4 Circuit High Input
P1510  Idle Air Control (IAC) Solenoid Valve Signal No. 1 Circuit Low Input
P1511  Idle Air Control (IAC) Solenoid Valve Signal No. 1 Circuit High Input
P1512  Idle Air Control (IAC) Solenoid Valve Signal No. 2 Circuit Low Input
P1513  Idle Air Control (IAC) Solenoid Valve Signal No. 2 Circuit High Input
P1514  Idle Air Control (IAC) Solenoid Valve Signal No. 3 Circuit Low Input
P1515  Idle Air Control (IAC) Solenoid Valve Signal No. 3 Circuit High Input
P1516  Idle Air Control (IAC) Solenoid Valve Signal No. 4 Circuit Low Input
P1517  Idle Air Control (IAC) Solenoid Valve Signal No. 4 Circuit High Input
P1518  Starter Switch Circuit Low Input
P1560  Back-Up Voltage Circuit Malfunction
P1698 (4) Engine Torque Control Cut Signal Circuit Low Input
P1699 (4) Engine Torque Control Cut Signal Circuit High Input
P1700 (4) Throttle Position (TP) Sensor Circuit Malfunction (A/T)
P1711 (4) Engine Torque Control Signal No. 1 Circuit Malfunction (A/T)
P1712 (4) Engine Torque Control Signal No. 2 Circuit Malfunction (A/T)
(1) All codes apply to all 2.5L models unless otherwise specified.
(2) Baja, Legacy and Outback
(3) Forester, Impreza and Outback Sport.
(4) Covered in entirety in appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
(5) A/T models only.
(6) M/T models only.
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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.