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 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC (1) | Description | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| P0031 (3) | Oxygen Sensor Heater Control Circuit Low (B1, S1) | ||||||||
| P0032 (3) | Oxygen Sensor Heater Control Circuit High (B1, S1) | ||||||||
| P0037 (3) | Oxygen Sensor Heater Control Circuit Low (B1, S2) | ||||||||
| P0038 (3) | Oxygen Sensor Heater Control Circuit High (B1, S2) | ||||||||
| P0051 (3) | Oxygen Sensor Heater Control Circuit Low (B2, S1) | ||||||||
| P0052 (3) | Oxygen Sensor Heater Control Circuit High (B2, S1) | ||||||||
| P0057 (3) | Oxygen Sensor Heater Control Circuit Low (B2, S2) | ||||||||
| P0058 (3) | Oxygen Sensor Heater Control Circuit High (B2, S2) | ||||||||
| P0100 (3) | Mass Airflow Meter Circuit | ||||||||
| P0101 | Mass Airflow Meter Circuit Range/Performance | ||||||||
| P0102 (3) | Mass Airflow Meter Circuit Low Input | ||||||||
| P0103 (3) | Mass Airflow Meter Circuit High Input | ||||||||
| P0110 (3) | Intake Air Temperature Sensor Circuit | ||||||||
| P0112 (3) | Intake Air Temperature Sensor Circuit Low Input | ||||||||
| P0113 (3) | Intake Air Temperature Sensor Circuit High Input | ||||||||
| P0115 (3) | Engine Coolant Temperature Sensor Circuit | ||||||||
| P0116 | Engine Coolant Temperature Sensor Circuit Range/Performance | ||||||||
| P0117 (3) | Engine Coolant Temperature Sensor Circuit Low Input | ||||||||
| P0118 (3) | Engine Coolant Temperature Sensor Circuit High Input | ||||||||
| P0120 | Throttle Pedal Position Sensor/Switch "A" Circuit | ||||||||
| P0121 | Throttle Pedal Position Sensor/Switch "A" Circuit Range/Performance | ||||||||
| P0122 | Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input | ||||||||
| P0123 | Throttle/Pedal Position Sensor/Switch "A" Circuit High Input | ||||||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||||||
| P0128 | Thermostat Malfunction | ||||||||
| P0130 | Oxygen Sensor Circuit (B1, S1) | ||||||||
| P0133 | Oxygen Sensor Circuit Slow Response (B1, S1) | ||||||||
| P0134 | Oxygen Sensor Circuit No Activity (B1, S1) | ||||||||
| P0136 | Heated Oxygen Sensor Circuit (B1, S2) | ||||||||
| P0150 | Heated Oxygen Sensor Circuit (B2, S1) | ||||||||
| P0153 | Heated Oxygen Sensor Circuit Slow Response (B2, S1) | ||||||||
| P0154 | Oxygen Sensor Circuit No Activity (B2, S1) | ||||||||
| P0156 | Heated Oxygen Sensor Circuit (B2, S2) | ||||||||
| P0171 | System Too Lean (B1) | ||||||||
| P0172 | System Too Rich (B1) | ||||||||
| P0174 | System Too Lean (B2) | ||||||||
| P0175 | System Too Rich (B2) | ||||||||
| P0220 | Throttle/Pedal Position Sensor/Switch "B" Circuit | ||||||||
| P0222 | Throttle/Pedal Position Sensor/Switch "B" Circuit Low Input | ||||||||
| P0223 | Throttle/Pedal Position Sensor/Switch "B" Circuit High Input | ||||||||
| P0230 (4) | Fuel Pump Primary Circuit | ||||||||
| P0300 (2) | Random/Multiple Cylinder Misfire Detected | ||||||||
| P0301 (2) | Cylinder No. 1 Misfire Detected | ||||||||
| P0302 (2) | Cylinder No. 2 Misfire Detected | ||||||||
| P0303 (2) | Cylinder No. 3 Misfire Detected | ||||||||
| P0304 (2) | Cylinder No. 4 Misfire Detected | ||||||||
| P0305 (2) | Cylinder No. 5 Misfire Detected | ||||||||
| P0306 (2) | Cylinder No. 6 Misfire Detected | ||||||||
| P0307 (2) | Cylinder No. 7 Misfire Detected | ||||||||
| P0308 (2) | Cylinder No. 8 Misfire Detected | ||||||||
| P0325 (3) | Knock Sensor No. 1 Circuit | ||||||||
| P0330 (3) | Knock Sensor No. 2 Circuit | ||||||||
| P0335 | Crankshaft Position Sensor "A" Circuit | ||||||||
| P0339 (4) | Crankshaft Position Sensor "A" Circuit Intermittent | ||||||||
| P0340 | Camshaft Position Sensor "A" Circuit (B1 Or Single Circuit) | ||||||||
| P0341 | Camshaft Position Sensor "A" Circuit Range/Performance (B1 Or Single Circuit) | ||||||||
| P0351 (3) | Ignition Coil "A" Primary/Secondary Circuit | ||||||||
| P0352 (3) | Ignition Coil "B" Primary/Secondary Circuit | ||||||||
| P0353 (3) | Ignition Coil "C" Primary/Secondary Circuit | ||||||||
| P0354 (3) | Ignition Coil "D" Primary/Secondary Circuit | ||||||||
| P0355 (3) | Ignition Coil "E" Primary/Secondary Circuit | ||||||||
| P0356 (3) | Ignition Coil "F" Primary/Secondary Circuit | ||||||||
| P0357 (3) | Ignition Coil "G" Primary/Secondary Circuit | ||||||||
| P0358 (3) | Ignition Coil "H" Primary/Secondary Circuit | ||||||||
| P0420 | Catalyst System Efficiency Below Threshold (B1) | ||||||||
| P0430 | Catalyst System Efficiency Below Threshold (B2) | ||||||||
| P0441 | Incorrect EVAP Purge Flow | ||||||||
| P0442 | Evaporative Emission Control System Leak Detected (Small Leak) | ||||||||
| P0446 | EVAP Vent Control Malfunction | ||||||||
| P0451 | EVAP Pressure Sensor/Switch Range/Performance | ||||||||
| P0452 | EVAP Pressure Sensor/Switch Low Input | ||||||||
| P0453 | EVAP Pressure Sensor/Switch High Input | ||||||||
| P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) | ||||||||
| P0500 | Vehicle Speed Sensor "A" Circuit | ||||||||
| P0503 | Vehicle Speed Sensor "A" Circuit Intermittent/Erratic/High | ||||||||
| P0504 | Brake Switch "A"/"B"Correlation | ||||||||
| P0505 | Idle Control System Malfunction | ||||||||
| P0560 | System Voltage | ||||||||
| P0604 | ECM Malfunction (Electronic Throttle Control System Circuit) | ||||||||
| P0606 | ECM/PCM Processor | ||||||||
| P0607 | Engine Control Module Performance | ||||||||
| P0617 | Starter Relay Circuit High | ||||||||
| P0657 | Actuator Supply Circuit Voltage Circuit Open | ||||||||
| P2102 | Throttle Actuator Control Motor Circuit Low | ||||||||
| P2103 | Throttle Actuator Control Motor Circuit High | ||||||||
| P2111 | Throttle Actuator Control System Stuck Open | ||||||||
| P2112 | Throttle Actuator Control System Stuck Closed | ||||||||
| P2118 | Throttle Actuator Control Motor Current Range/Performance | ||||||||
| P2119 | Throttle Actuator Control Throttle Body Range/Performance | ||||||||
| P2120 | Throttle/Pedal Position Sensor/Switch "D" Circuit | ||||||||
| P2121 | Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance | ||||||||
| P2122 | Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input | ||||||||
| P2123 | Throttle/Pedal Position Sensor/Switch "D" Circuit High Input | ||||||||
| P2125 | Throttle/Pedal Position Sensor/Switch "E" Circuit | ||||||||
| P2127 | Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input | ||||||||
| P2128 | Throttle/Pedal Position Sensor/Switch "E" Circuit High Input | ||||||||
| P2135 | Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation | ||||||||
| P2138 | Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation | ||||||||
| P2195 | Oxygen Sensor Signal Stuck Lean (B1, S1) | ||||||||
| P2196 | Oxygen Sensor Signal Stuck Rich (B1, S1) | ||||||||
| P2197 | Oxygen Sensor Signal Stuck Lean (B2, S1) | ||||||||
| P2198 | Oxygen Sensor Signal Stuck Rich (B2, S1) | ||||||||
|
|||||||||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.