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
Engine Control System Self Diagnostics
- Introduction
- Self-Diagnostic System
- Scan Tool Problems
- Summary
- Diagnostic Trouble Code Definitions
- Diagnostic Tests
- Notes
- DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1) & DTC P0020: Camshaft Position "A" Actuator Circuit (Bank 2)
- DTC P0011, DTC P0012, DTC P0021 &/Or DTC P0022
- DTC P0016: Crankshaft Position/Camshaft Position Correlation (Bank 1, Sensor "A") Or DTC P0018: Crankshaft Position/Camshaft Position Correlation (Bank 2, Sensor "A")
- DTC P0036: Oxygen Sensor Heater Control Circuit (Bank 1 Sensor 2)
- DTC P0100: Mass Airflow Meter Circuit
- DTC P0101: Mass Airflow Meter Circuit Range/Performance
- DTC P0110: Intake Air Temperature Sensor Circuit
- DTC P0115: Engine Coolant Temperature Sensor Circuit
- DTC P0116 : Engine Coolant Temperature Sensor Circuit Range/Performance Or DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0120: Throttle/Pedal Position Sensor/Switch "A" Circuit
- DTC P0121: Throttle Position Sensor Circuit Range/Performance
- DTC P0128: Thermostat Malfunction
- DTC P0134: Oxygen (A/F) Sensor Circuit No Activity Detected (Bank 1 Sensor 1) Or DTC P0154: Oxygen (A/F) Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
- DTC P0135: Oxygen (A/F) Sensor Heater Circuit (Bank 1 Sensor 1) &/Or DTC P0155: Oxygen (A/F) Sensor Heater Circuit (Bank 2 Sensor 1)
- DTC P0136: Heated Oxygen Sensor Circuit (Bank No. 1 Sensor No. 2)
- DTC P0171, DTC P0172, DTC P0174 &/Or DTC P0175
- DTC P0300, DTC P0301, DTC P0302, DTC P0303, DTC P0304, DTC P0305 Or DTC P0306
- DTC P0325: Knock Sensor "1" Circuit (Bank 1 Or Single Sensor) & DTC P0330: Knock Sensor "2" Circuit (Bank 2)
- DTC P0335: Crankshaft Position Sensor "A" Circuit Or DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent
- DTC P0340, DTC P0341, DTC P0345 & DTC P0346
- DTC P0351, DTC P0352, DTC P0353, DTC P0354, DTC P0355 Or DTC P0356
- DTC P0420: Catalyst System Efficiency Below Threshold
- DTC P0441: EVAP Emission Control System Incorrect Purge Flow Or DTC P0446: EVAP Emission Control System Vent Control Circuit
- DTC P0442: EVAP Emission Control System Leak Detected (Small Leak) Or DTC P0456: EVAP Emission Control System Leak Detected (Very Small Leak)
- DTC P0450: EVAP Pressure Sensor Circuit Or DTC P0451: EVAP Pressure Sensor Range/Performance
- DTC P0500: Vehicle Speed Sensor Circuit
- DTC P0505: Idle Control System Malfunction
- DTC P0560: System Voltage
- DTC P0724: Brake Switch "B" Circuit High
- DTC P2195, DTC P2196, DTC P2197, DTC P2198, DTC P2237 &/Or DTC P2240
- DTC P2A00: A/F Sensor Circuit Slow Response (Bank 1 Sensor 1) &/Or DTC P2A03: A/F Sensor Circuit Slow Response (Bank 2 Sensor 1)
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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