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 Toyota Sienna LEFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC (1) | Description | ||||
|---|---|---|---|---|---|
| P0010 | Camshaft Position "A" Actuator Circuit (Bank 1) | ||||
| P0011 | Camshaft Position "A" Timing Over Advanced Or System Performance (Bank 1) | ||||
| P0012 | Camshaft Position "A" Timing Over Retarded (Bank 1) | ||||
| P0016 | Crankshaft Position/Camshaft Position Correlation (Bank 1, Sensor "A") | ||||
| P0018 | Crankshaft Position/Camshaft Position Correlation (Bank 2, Sensor "A") | ||||
| P0020 | Camshaft Position "A" Actuator Circuit (Bank 2) | ||||
| P0021 | Camshaft Position "A" Timing Over Advanced Or System Performance (Bank 2) | ||||
| P0022 | Camshaft Position "A" Timing Over Retarded (Bank 2) | ||||
| P0036 (2) | Oxygen Sensor Heater Control Circuit Low (B1, S2) | ||||
| 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 Position Sensor Circuit | ||||
| P0121 | Throttle Position Sensor Circuit Range/Performance | ||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||
| P0128 | Thermostat Malfunction | ||||
| P0134 | Oxygen Sensor Circuit No Activity Detected (B1, S1) | ||||
| P0135 (2) | Oxygen (A/F) Sensor Heater Circuit (B1, S1) | ||||
| P0136 | Oxygen Sensor Circuit (B1 S2) | ||||
| P0154 | Oxygen Sensor Circuit No Activity Detected (B2, S1) | ||||
| P0155 (2) | Oxygen (A/F) Sensor Heater Circuit (B2, S1) | ||||
| P0171 | System Too Lean (Bank No. 1) | ||||
| P0172 | System Too Rich (Bank No. 1) | ||||
| P0174 | System Too Lean (Bank No. 2) | ||||
| P0175 | System Too Rich (Bank No. 2) | ||||
| 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 | ||||
| P0305 | Cylinder No. 5 Misfire Detected | ||||
| P0306 | Cylinder No. 6 Misfire Detected | ||||
| P0325 (2) | Knock Sensor No. 1 Circuit | ||||
| P0330 (2) | Knock Sensor No. 2 Circuit | ||||
| P0335 | Crankshaft Position Sensor "A" Circuit | ||||
| P0339 | Crankshaft Position Sensor "A" Circuit Intermittent | ||||
| P0340 | Camshaft Position Sensor Circuit | ||||
| P0351 (2) | Ignitor No. 1 Circuit | ||||
| P0352 (2) | Ignition Coil "B" Primary/Secondary Circuit | ||||
| P0353 (2) | Ignition Coil "C" Primary/Secondary Circuit | ||||
| P0354 (2) | Ignition Coil "D" Primary/Secondary Circuit | ||||
| P0355 (2) | Ignition Coil "E" Primary/Secondary Circuit | ||||
| P0356 (2) | Ignition Coil "F" Primary/Secondary Circuit | ||||
| P0420 | Catalyst System Efficiency Below Threshold | ||||
| P0441 | Incorrect EVAP Purge Flow | ||||
| P0442 | EVAP Leak Detected (Small Leak) | ||||
| P0446 | EVAP Vent Control Malfunction | ||||
| P0450 | EVAP Pressure Sensor Circuit | ||||
| P0451 | EVAP Pressure Sensor Range/Performance | ||||
| P0456 | EVAP Leak Detected (Very Small Leak) | ||||
| P0500 | Vehicle Speed Sensor Circuit | ||||
| P0505 | Idle Control System Malfunction | ||||
| P0560 | System Voltage | ||||
| P0724 | Brake Switch "B" Circuit High | ||||
| P2195 | Oxygen (A/F) Sensor Signal Stuck Lean (B1 S1) | ||||
| P2196 | Oxygen (A/F) Sensor Signal Stuck Rich (B1 S1) | ||||
| P2197 | Oxygen (A/F) Sensor Signal Stuck Lean (B2 S1) | ||||
| P2198 | Oxygen (A/F) Sensor Signal Stuck Rich (B2 S1) | ||||
| P2237 | Oxygen Sensor Pumping Current Circuit Open (A/F Sensor) (B1 S1) | ||||
| P2240 | Oxygen Sensor Pumping Current Circuit Open (A/F Sensor) (B2 S1) | ||||
| P2A00 | Air/Fuel Sensor Circuit Slow Response (B1 S1) | ||||
| P2A03 | Air/Fuel Sensor Circuit Slow Response (B2 S1) | ||||
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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.
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