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.
2001 Lexus LX 470FACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics
- Introduction
- Self-Diagnostic System
- Scan Tool Problems
- Summary
- Diagnostic Tests
- Notes
- DTC P0100: Mass Airflow (MAF) Meter Circuit
- DTC P0101: Mass Airflow (MAF) Meter Circuit Range/Performance
- DTC P0110: Intake Air Temperature (IAT) Sensor Circuit
- DTC P0115: Engine Coolant Temperature (ECT) Sensor Circuit
- DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance
- DTC P0120: Throttle (TP)/Pedal Position Sensor Switch "A" Circuit Malfunction
- DTC P0121: Throttle (TP)/Pedal Position Sensor Switch "A" Circuit Range/Performance Fault
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0130/P0150: Heated Oxygen Sensor No. 1 Circuit
- DTC P0133/P0153: Heated Oxygen Sensor No. 1 Circuit Slow Response
- DTC P0135/P0155: Heated Oxygen Sensor No. 1 Heater Circuit
- DTC P0136/P0156: Heated Oxygen Sensor No. 2 Circuit
- DTC P0141/P0161: Heated Oxygen Sensor No. 2 Heater Circuit
- DTC P0150: Heated Oxygen Sensor No. 1 Circuit
- DTC P0153: Heated Oxygen Sensor No. 1 Circuit Slow Response
- DTC P0155: Heated Oxygen Sensor No. 1 Heater Circuit
- DTC P0156: Heated Oxygen Sensor No. 2 Circuit
- DTC P0161: Heated Oxygen Sensor No. 2 Heater Circuit
- DTC P0171 Or P0172: System Too Lean/Rich
- DTC P0300: Random Misfire Detected
- DTCS P0301-P0308: Cylinders No. 1-8 Misfire Detected
- DTC P0325 Or P0330: Knock Sensor No. 1 Or 2 Circuit
- DTC P0335 Or P1335: Crankshaft Position (CKP) Sensor Circuit
- DTC P0340: Camshaft Position (CMP) Sensor Circuit
- DTC P0420 Or P0430: Catalyst System Efficiency Below Threshold
- DTC P0440: Evaporative Emission Control System
- DTC P0441: Incorrect EVAP Purge Flow Or DTC P0446: EVAP Vent Control Circuit
- DTC P0450: EVAP Pressure Sensor Circuit Or DTC P0451: EVAP Pressure Sensor Range/Performance
- DTC P0500: Vehicle Speed Sensor Circuit
- DTC P0505: Idle Air Control (IAC) System Circuit
- DTC P1120: Accelerator Pedal Position (App) Sensor Circuit
- DTC P1121: Accelerator Pedal Position (App) Sensor Range/Performance
- DTC P1125: Throttle Control Motor Circuit
- DTC P1126: Magnetic Clutch Circuit
- DTC P1127: Electronic Throttle Control System Actuator Power Source Circuit
- DTC P1128: Throttle Control Motor Lock Circuit
- DTC P1129: Electronic Throttle Control System Circuit
- DTC P1200: Fuel Pump Relay/Ecu Circuit
- DTC P1300, P1305, P1310, P1315, P1320, P1325, P1330 Or P1340: IGNITOR Circuit Malfunction
- DTC P1335: Crankshaft Position (CKP) Sensor Circuit
- DTC P1520: Stoplight Switch Signal Circuit
- DTC P1600: ECM Batt Circuit
- DTC P1633: ECM Malfunction (Electronic Throttle Control System Circuit)
- DTC P1780: Park/Neutral Position (PNP) Switch Circuit
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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