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 LS 430FACTORY OEM SERVICE PROCEDURE
Engine Performance DTCS
ENGINE PERFORMANCE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| P0100 | Mass Airflow (MAF) Sensor Circuit |
| P0101 | Mass Airflow (MAF) Sensor Circuit Range/Performance Fault |
| P0110 | Intake Air Temperature (IAT) Sensor Circuit |
| P0115 | Engine Coolant Temperature (ECT) Circuit |
| P0116 | Engine Coolant Temperature (ECT) Circuit Range/Performance Fault |
| P0120 | Throttle (TP)/Pedal Position Sensor "A" Circuit Malfunction |
| P0121 | Throttle (TP)/Pedal Position Sensor "A" Circuit Range/Performance Fault |
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control |
| P0128 | Thermostat Malfunction |
| P0130/P0150 | Heated Oxygen Sensor Circuit Malfunction (Bank No. 1 & 2 Sensor No. 1) |
| P0133/P0153 | Heated Oxygen Sensor Circuit Slow Response (Bank No. 1 & 2 Sensor No. 1) |
| P0135/P0155 | Heated Oxygen Sensor Heater Circuit (Bank No. 1 & 2 Sensor No. 1) |
| P0136/P0156 | Heated Oxygen Sensor Circuit Malfunction (Bank No. 1 & 2 Sensor No. 2) |
| P0141/P0161 | Heated Oxygen Sensor Heater Circuit (Bank No. 1 & 2 Sensor No. 2) |
| P0171/P0172 | System Too Lean/Rich (Bank No. 1) |
| P0174/P0175 | System Too Lean/Rich (Bank No. 2) |
| P0300 | Random Multiple Cylinder Misfire Detected |
| P0301-P0308 | Cylinders No. 1-8 Misfire Detected |
| P0325/P0330 | Knock Sensor Circuit Malfunction (Bank No. 1 & 2) |
| P0335 | Crankshaft Position (CKP) Sensor "A" Circuit Malfunction |
| P0340 | Camshaft Position (CMP) Sensor Circuit Malfunction |
| P0420/P0430 | Catalyst System Efficiency Below Threshold (Bank No. 1 & 2) |
| P0440 | EVAP System Malfunction |
| P0441 | Incorrect EVAP System Purge Flow |
| P0446 | EVAP System Vent Control Fault |
| P0450 | EVAP System Pressure Sensor Malfunction |
| P0451 | EVAP System Pressure Sensor Range/Performance Fault |
| P0500 | Vehicle Speed Sensor (VSS) Malfunction |
| P0505 | Idle Control System Malfunction |
| P1120 | Accelerator Pedal Position Sensor Circuit Malfunction |
| P1121 | Accelerator Pedal Position Sensor Circuit Malfunction |
| P1125 | Throttle Control Motor Circuit Malfunction |
| P1127 | Electronic Throttle Control System (ETCS) Actuator Power Source Circuit Malfunction |
| P1128 | Throttle Control Motor Lock Malfunction |
| P1129 | Electronic Throttle Control System (ETCS) Malfunction |
| P1200 | Fuel Pump Relay/ECU Circuit Malfunction |
| P1300, P1305, P1310, P1315, P1320, P1325, P1330 & P1340 | Ignitor Circuit Malfunction No. 1-8 |
| P1335 | Crankshaft Position (CKP) Sensor |
| P1345/P1350 | Variable Valve Timing (VVT) Sensor Circuit Malfunction |
| P1346/P1351 | Variable Valve Timing (VVT) Circuit Range/Performance Fault |
| P1349/P1354 | Variable Valve Timing (VVT) System Malfunction |
| P1520 | Stoplight Switch Signal Malfunction |
| P1600 | ECM Batt Malfunction |
| P1633 | Electronic Throttle Control System (ETCS) Circuit ECM Malfunction |
| P1645 | Body ECU Malfunction |
| P1656/P1663 | Oil Control Valve (OCV) Circuit Malfunction |
| P1780 | Park/Neutral Position Switch Malfunction |
Factory Service Tools
Use the Manual With the Right Hardware
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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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