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.
2005 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine - Diagnostics
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Pre-Check
- Readiness Monitor Drive Pattern
- Problem Symptoms Table
- Terminals Of ECM
- Diagnostic Trouble Code Chart
- Parts Location
- DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1)
- DTC P0011, P0012: Camshaft Position "A"-Timing Over-Actuator Or System Performance (Bank 1), Camshaft Position "A" -Timing Over-Retarded (Bank 1)
- DTC P0016: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
- DTC P0031, P0032, P0037, P0038, P0051, P0052, P0057, P0058: Oxygen Sensor Heater Control Circuit Low/High (Bank 1 Sensor 1)/(Bank 1 Sensor 2)/(Bank 2 Sensor 1)/(Bank 2 Sensor 2)
- DTC P0100, P0102, P0103: Mass or Volume Air Flow Circuit, Mass or Volume Air Flow Circuit Low/High Input
- DTC P0101: Mass Or Volume Air Flow Circuit Range/Performance Problem
- DTC P0110, P0112, P0113: Intake Air Temperature Circuit, Intake Air Temperature Circuit Low/High Input
- DTC P0115, P0117, P0118: Engine Coolant Temperature Circuit, Engine Coolant Temperature Circuit Low/High Input
- DTC P0116: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
- DTC P0120, P0122, P0123, P0220, P0222, P0223, P2135: Throttle/Pedal Position Sensor/Switch "A" Circuit, Throttle/Pedal Position Sensor/Switch "A" Circuit Low/High Input, Throttle/Pedal Position Sensor/Switch "B" Circuit, Throttle/Pedal Position Sensor/Switch "B" Circuit Low/High Input, Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation
- DTC P0121: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
- DTC P0130, P0150, P2195, P2196, P2197, P2198: Oxygen Sensor Circuit (Bank 1 Sensor 1)/(Bank 2 Sensor 1), Oxygen Sensor Signal Stuck Lean/Rich (Bank 1 Sensor 1)/(Bank 2 Sensor 1)
- DTC P0133, P0153: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1)/(Bank 2 Sensor 1)
- DTC P0134, P0154: Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1)/(Bank 2 Sensor 1)
- DTC P0136, P0156: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)/(Bank 2 Sensor 2)
- DTC P0171: System Too Lean/Rich (Bank 1)/(Bank 2)
- DTC P0230: Fuel Pump Primary Circuit
- DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306: Random/Multiple Cylinder Misfire Detected, Cylinder 1/2/3/4/5/6 Misfire Detected
- DTC P0325, P0330: Knock Sensor 1 Circuit (Bank 1 Or Single Sensor), Knock Sensor 2 Circuit Malfunction (Bank 2)
- DTC P0335, P0339: Crankshaft Position Sensor "A" Circuit/Intermittent
- DTC P0340, P0341: Camshaft Position Sensor "A" Circuit (Bank 1 Or Single Sensor), Camshaft Position Sensor "A" Circuit Range/Performance (Single Sensor)
- DTC P0351: Igniter Coil "A" Primary/Secondary Circuit
- DTC P0420, P0430: Catalyst System Efficiency Below Threshold (Bank 1)/(Bank 2)
- DTC P0441, P0446: Evaporative Emission Control System Incorrect Purge Flow/Vent Control Circuit
- DTC P0442, P0456: Evaporative Emission Control System Leak Detected (Small Leak)/(Very Small Leak)
- DTC P0451, P0452, P0453: Evaporative Emission Control System Pressure Sensor/Switch Range/Performance, Evaporative Emission Control System Pressure Sensor/Switch Low/High Input
- DTC P0500, P0503: Vehicle Speed Sensor "A", Vehicle Speed Sensor "A" Intermittent/Erratic/High
- DTC P0505: Idle Air Control System
- DTC P0550, P0552, P0553: Power Steering Pressure Sensor/Switch Circuit, Power Steering Pressure Sensor/Switch Circuit Low/High Input
- DTC P0560: System Voltage
- DTC P0604, P0606, P0607, P0657: Internal Control Module Random Access Memory (Ram) Error, ECM/Pcm Processor, Control Module Performance, Actuator Supply Voltage Circuit/Open
- DTC P0617: Starter Relay Circuit High
- DTC P0630: VIN Not Programmed Of Mismatch - ECM/Pcm
- DTC P1126: Magnetic Clutch Circuit
- DTC P2102, P2103: Throttle Actuator Control Motor Circuit Low/High
- DTC P2111/P2112: Throttle Actuator Control System-Stuck Open/Closed
- DTC P2118: Throttle Actuator Control Motor Current Range/Performance
- DTC P2119: Throttle Actuator Control Throttle Body Range/Performance
- DTC P2120, P2122, P2123, P2125, P2127, P2128, P2138: Throttle/Pedal Position Sensor/Switch "D" Circuit, Throttle/Pedal Position Sensor/Switch "D" Circuit Low/High Input, Throttle/Pedal Position Sensor/Switch "E" Circuit, Throttle/Pedal Position Sensor/Switch "E" Circuit Low/High Input, Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation
- DTC P2121: Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance
- ECM Power Source Circuit
- IACV Control Circuit
- Mil Circuit Malfunction
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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