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 MANUALSTOYOTA2003PRIUSREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM SELF DIAGNOSTICSDIAGNOSTIC TROUBLE CODE DEFINITIONS
2003 Toyota Prius
Diagnostic Trouble Code Definitions
2003 Toyota PriusSECTION Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC (1) | Description | ||||
|---|---|---|---|---|---|
| P0100 (2) | Mass Airflow Meter Circuit | ||||
| P0101 | Mass Airflow Meter Circuit Range/Performance | ||||
| P0110 (2) | Intake Air Temperature Sensor Circuit | ||||
| P0115 (2) | Engine Coolant Temperature Sensor Circuit | ||||
| P0116 | Engine Coolant Temperature Sensor Circuit Range/Performance | ||||
| P0120 (2) | Throttle/Pedal Position Sensor/Switch Circuit | ||||
| P0121 | Throttle/Pedal Position Sensor/Switch Circuit Range/Performance | ||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||
| P0128 | Thermostat Malfunction | ||||
| P0130 | Heated Oxygen Sensor No. 1 Circuit | ||||
| P0133 | Heated Oxygen Sensor No. 1 Circuit Slow Response | ||||
| P0135 (2) | Heated Oxygen Sensor No. 1 Heater Circuit | ||||
| P0136 | Heated Oxygen Sensor No. 2 Circuit | ||||
| P0141 (2) | Heated Oxygen Sensor No. 2 Heater Circuit | ||||
| P0171 | System Too Lean | ||||
| P0172 | System Too Rich | ||||
| P0300 | Random/Multiple Cylinder Misfire Detected | ||||
| 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 (2) | Knock Sensor Circuit | ||||
| P0335 | Crankshaft Position Sensor Circuit | ||||
| P0340 | Camshaft Position Sensor Circuit | ||||
| P0420 | Catalyst System Efficiency Below Threshold | ||||
| P0440 | Evaporative Emission Control System | ||||
| P0441 | Incorrect EVAP Purge Flow | ||||
| P0446 | EVAP Vent Control Malfunction | ||||
| P0450 | EVAP Pressure Sensor Circuit | ||||
| P0451 | EVAP Pressure Sensor Range/Performance | ||||
| P0500 | Vehicle Speed Sensor Circuit | ||||
| P0505 | Idle Control System Malfunction | ||||
| P1125 | Throttle Control Motor Circuit | ||||
| P1127 | Electronic Throttle Control System Actuator Power Source Circuit | ||||
| P1128 | Throttle Control Motor Lock Malfunction | ||||
| P1129 | Electronic Throttle Control System Malfunction | ||||
| P1300 (2) | Ignitor No. 1 Circuit | ||||
| P1305 (2) | Ignitor No. 2 Circuit | ||||
| P1310 (2) | Ignitor No. 3 Circuit | ||||
| P1315 (2) | Ignitor No. 4 Circuit | ||||
| P1346 | Variable Valve Timing Sensor Circuit Range/Performance | ||||
| P1349 | Variable Valve Timing System Malfunction | ||||
| P1430 | Vacuum Sensor Circuit Malfunction | ||||
| P1431 | Vacuum Sensor Circuit Range/Performance | ||||
| P1436 | By-Pass Valve Malfunction | ||||
| P1437 | Vacuum Line Malfunction | ||||
| P1455 | Fuel Tank Leak Detected | ||||
| P1525 | Resolver Vehicle Malfunction | ||||
| P1600 | Engine Control Module BATT Circuit | ||||
| P1633 | Engine Control Module Malfunction (Electronic Throttle Control System Circuit) | ||||
| P1636 | HV ECU Malfunction | ||||
| P1637 | ESTP Signal Malfunction | ||||
| P1656 | Oil Control Valve Circuit Malfunction | ||||
| P3190 | Poor Engine Power | ||||
| P3191 | Engine Does Not Start | ||||
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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.