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.
2003 Subaru Outback L.L. Bean EditionFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| Code No. | Circuit Affected | ||
|---|---|---|---|
| P0030 | Bank No. 1 (Right), No. 1 HO2S (Front) Heater Circuit | ||
| P0031 | Bank No. 1 (Right), No. 1 HO2S (Front) Heater Circuit, Low Input | ||
| P0032 | Bank No. 1 (Right), No. 1 HO2S (Front) Heater Circuit, High Input | ||
| P0037 | Bank No. 1 (Right), No. 2 HO2S (Rear) Heater Circuit, Low Input | ||
| P0038 | Bank No. 1 (Right), No. 2 HO2S (Rear) Heater Circuit, High Input | ||
| P0050 | Bank No. 2 (Left), No. 1 HO2S (Front) Heater Circuit | ||
| P0051 | Bank No. 2 (Left), No. 1 HO2S (Front) Heater Circuit, Low Input | ||
| P0052 | Bank No. 2 (Left), No. 1 HO2S (Front) Heater Circuit, High Input | ||
| P0068 | Manifold Absolute Pressure/Barometric Pressure Cicuit Range/Performance | ||
| P0107 | Intake Manifold Pressure Sensor Circuit, Low Input | ||
| P0108 | 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 | 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 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||
| P0128 | Thermostat Malfunction | ||
| P0129 | Barometric Pressure Too Low | ||
| P0130 | O2 Sensor Circuit, (Front) | ||
| P0133 | Bank No. 1 (Right), No. 1 HO2S (Front) Circuit, Slow Response | ||
| P0134 | O2 Sensor Circuit, No Activity Detected (Front) | ||
| P0137 | Bank No. 1 (Right), No. 2 HO2S (Rear) Circuit, Low Input | ||
| P0138 | Bank No. 1 (Right), No. 2 HO2S (Rear) Circuit, High Input | ||
| P0139 | Bank No. 1 (Right), No. 2 HO2S (Rear) Circuit, Slow Response | ||
| P0153 | Bank No. 2 (Left), No. 1 HO2S (Front) Circuit, Slow Response | ||
| P0154 | O2 Sensor Circuit, No Activity Detected (Rear) | ||
| P0171 | Fuel Trim No. 1 (Right Bank), Malfunction (HO2S Too Lean) | ||
| P0172 | Fuel Trim No. 1 (Right Bank), Malfunction (HO2S Too Rich) | ||
| P0174 | Fuel Trim No. 2 (Left Bank), Malfunction (HO2S Too Lean) | ||
| P0175 | Fuel Trim No. 2 (Left Bank), Malfunction (HO2S 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 | ||
| P0230 | Fuel Pump Primary Circuit | ||
| P0301 | Cylinder No. 1 Misfire Detected | ||
| P0302 | Cylinder No. 2 Misfire Detected | ||
| P0303 | Cylinder No. 3 Misfire Detected | ||
| P0304 | Cylinder No. 4 Misfire Detected | ||
| P0305 | Cylinder No. 5 Misfire Detected | ||
| P0306 | Cylinder No. 6 Misfire Detected | ||
| P0327 | Knock Sensor (KS) No. 1 (Right Bank) Circuit, Low Input | ||
| P0328 | Knock Sensor (KS) No. 1 (Right Bank) Circuit, High Input | ||
| P0332 | Knock Sensor (KS) No. 2 (Left Bank) Circuit, Low Input | ||
| P0333 | Knock Sensor (KS) No. 2 (Left Bank) Circuit, High Input | ||
| P0335 | Crankshaft Position (CKP) 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 | EGR System Malfunction | ||
| P0420 | Catalyst System Efficiency Below Threshold | ||
| P0442 | Evaporative Emission Control System Malfunction | ||
| P0447 | Evaporative Emission Control System Vent Control Low Input | ||
| P0448 | Evaporative Emission Control System Vent Control High Input | ||
| P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance Problem | ||
| P0452 | Evaporative Emission Control System Pressure Sensor Low Input | ||
| P0453 | Evaporative Emission Control System Pressure Sensor High Input | ||
| P0456 | Evaporative Emission Control System Leak Detected (Small Leak) | ||
| P0457 | Evaporative Emission Control System Malfunction | ||
| P0458 | Evaporative Emission Control Purge Control Valve Circuit, Low Input | ||
| P0459 | Evaporative Emission Control Purge Control Valve Circuit, High Input | ||
| P0461 | Fuel Level Sensor Circuit, Range/Performance Problem | ||
| P0462 | Fuel Level Sensor Circuit, Low Input | ||
| P0463 | Fuel Level Sensor Circuit, High Input | ||
| P0464 | Fuel Level Sensor Intermittent Input | ||
| P0483 | Cooling Fan Function Problem | ||
| P0502 | Vehicle Speed Sensor Circuit, Low Input | ||
| P0503 | Vehicle Speed Sensor Intermittent/Erratic/High | ||
| P0506 | Idle Control System RPM Lower Than Expected | ||
| P0507 | Idle Control System RPM Higher Than Expected | ||
| P0508 | Idle Control System Circuit, Low Input | ||
| P0509 | Idle Control System Circuit, High Input | ||
| P0512 | Starter Switch Circuit, High Input | ||
| P0519 | Idle Air Control Circuit, System Performance Problem | ||
| P0558 | Generator Circuit, Low Input | ||
| P0559 | Generator Circuit, High Input | ||
| P0565 | Cruise Control ON Signal | ||
| P0604 | Internal Control Module Memory Check Sum Error | ||
| P0661 | Induction Valve Control Solenoid Circuit, Low Input | ||
| P0662 | Induction Valve Control Solenoid Circuit, High Input | ||
| P0691 | Cooling Fan Relay No. 1 Circuit, Low Input | ||
| P0692 | Cooling Fan Relay No. 1 Circuit, High Input | ||
| P0703 (1) | Brake Switch Input Malfunction | ||
| P0705 (1) | Transmission Range Sensor Circuit, (PRNDL Input) | ||
| P0710 (1) | Transmission Fluid Temperature Sensor Circuit | ||
| P0716 (1) | Turbine Speed Sensor Circuit, Range/Performance Problem | ||
| P0720 (1) | Output Speed Sensor Circuit | ||
| P0726 (1) | Engine Speed Input Circuit, Range/Performance Problem | ||
| P0731 (1) | Gear 1 Incorrect Ratio | ||
| P0732 (1) | Gear 2 Incorrect Ratio | ||
| P0733 (1) | Gear 3 Incorrect Ratio | ||
| P0734 (1) | Gear 4 Incorrect Ratio | ||
| P0741 (1) | Torque Converter Clutch System Malfunction (A/T) | ||
| P0743 (1) | Torque Converter Clutch Circuit, Electrical | ||
| P0748 (1) | Pressure Control Solenoid "A" Electrical | ||
| P0753 (1) | Shift Solenoid "A" Electrical | ||
| P0758 (1) | Shift Solenoid "B" Electrical | ||
| P0771 (1) | Shift Solenoid "E" Performance Or Stuck Off | ||
| P0778 (1) | Pressure Control Solenoid "B" Electrical | ||
| P0785 (1) | Neutral Switch Input Circuit, Low | ||
| P0851 (1) | Neutral Position Switch Circuit, Low Input | ||
| P0852 (1) | Neutral Position Switch Circuit, High Input | ||
| P0864 (1) | Automatic Transmission Diagnosis Input Signal Circuit, Malfunction | ||
| P0865 (1) | Automatic Transmission Diagnosis Input Signal Circuit, Low Input | ||
| P0866 (1) | Automatic Transmission Diagnosis Input Signal Circuit, High Input | ||
| P1110 | Atmospheric Pressure Sensor Low Input | ||
| P1111 | Atmospheric Pressure Sensor High Input | ||
| P1134 | Front HO2S Micro-Computer Problem | ||
| P1152, P1153, P1154 & P1155 | Bank No. 1 (Right), No. 1 HO2S (Front) Circuit, Range/Performance Problem (Low Input) | ||
| P1400 | Fuel Tank Pressure Control Solenoid Valve Circuit, Low Input | ||
| P1420 | Fuel Tank Pressure Control Solenoid Valve Circuit, High Input | ||
| P1443 | Evaporative Emission Control System Vent Control Function Problem | ||
| P1446 | Fuel Tank Sensor Control Valve Circuit, Low | ||
| P1447 | Fuel Tank Sensor Control Valve Circuit, High | ||
| P1448 | Fuel Tank Sensor Control Valve Range/Performance Problem | ||
| P1518 | Starter Switch Circuit, Low Input | ||
| P1560 | Back-Up Voltage Circuit, Malfunction | ||
| P1698 (1) | Engine Torque Control Cut Signal Circuit, Low Input | ||
| P1699 (1) | Engine Torque Control Cut Signal Circuit, High Input | ||
| P1700 (1) | Throttle Position (TP) Sensor Circuit, Malfunction (A/T) | ||
| P1711 (1) | Engine Torque Control Signal No. 1 Circuit, Malfunction | ||
| P1712 (1) | Engine Torque Control Signal No. 2 Circuit, Malfunction | ||
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Factory Service Tools
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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.