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.
1998 Lexus LX 470FACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS
| DTC | Description | ||||
|---|---|---|---|---|---|
| P0100 (1) | Mass Airflow (MAF) Sensor Circuit | ||||
| P0101 (1) | Mass Airflow (MAF) Sensor Circuit Range/Performance Problem | ||||
| P0110 | Intake Air Temperature (IAT) Sensor Circuit | ||||
| P0115 | Engine Coolant Temperature (ECT) Sensor Circuit Fault | ||||
| P0116 (1) | Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Problem | ||||
| P0120 | Throttle Position (TP) Sensor Circuit Malfunction | ||||
| P0121 (1) | Throttle Position (TP) Sensor Circuit Range/Performance Fault | ||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||
| P0130 (1) | (2) Heated Oxygen Circuit (Sensor No. 1) | ||||
| P0133 (1) | (2) Heated Oxygen Sensor Circuit (Sensor No. 1) Slow Response | ||||
| P0135 (1) | Heated Oxygen Sensor Heater Circuit | ||||
| P0136 (1) | (2) Heated Oxygen Sensor Circuit (Sensor No. 2) | ||||
| P0141 (1) | Heated Oxygen Sensor Heater Circuit | ||||
| P0150 (1) | Heated Oxygen Circuit (Sensor No. 1) | ||||
| P0153 (1) | Heated Oxygen Sensor Circuit (Sensor No. 1) Slow Response | ||||
| P0155 (1) | Heated Oxygen Sensor Heater Circuit | ||||
| P0156 (1) | Heated Oxygen Sensor Circuit (Sensor No. 2) | ||||
| P0161 (1) | Heated Oxygen Sensor Heater Circuit | ||||
| P0171 (1) | System Too Lean (Fuel Trim) | ||||
| P0172 (1) | System Too Rich (Fuel Trim) | ||||
| P0300 | Random Misfire Detected | ||||
| P0301 (1) | Cylinder No. 1 Misfire Detected | ||||
| P0302 (1) | Cylinder No. 2 Misfire Detected | ||||
| P0303 (1) | Cylinder No. 3 Misfire Detected | ||||
| P0304 (1) | Cylinder No. 4 Misfire Detected | ||||
| P0305 (1) | Cylinder No. 5 Misfire Detected | ||||
| P0306 (1) | Cylinder No. 6 Misfire Detected | ||||
| P0307 (1) | Cylinder No. 7 Misfire Detected | ||||
| P0308 (1) | Cylinder No. 8 Misfire Detected | ||||
| P0325 | Knock Sensor No. 1 Circuit | ||||
| P0330 (1) | Knock Sensor No. 2 Circuit | ||||
| P0335 (1) | Crankshaft Position (CKP) Sensor "A" Circuit | ||||
| P0340 (1) | Camshaft Position (CMP) Sensor Circuit | ||||
| P0420 (1) | Catalyst System Efficiency Below Threshold | ||||
| P0430 (1) | Catalyst System Efficiency Below Threshold | ||||
| P0440 (1) | Evaporative Emission Control System Malfunction | ||||
| P0441 (1) | Incorrect EVAP Purge Flow | ||||
| P0446 (1) | EVAP Vent Control Malfunction | ||||
| P0450 | EVAP Pressure Sensor Fault | ||||
| P0451 | EVAP Pressure Sensor Range/Performance | ||||
| P0500 (1) | Vehicle Speed Sensor Malfunction | ||||
| P0505 (1) | Idle Air Control (IAC) System Malfunction | ||||
| P1120 | Accelerator Pedal Position (APP) Sensor Circuit Fault | ||||
| P1121 | Accelerator Pedal Position (APP) Sensor Range/Performance Fault | ||||
| P1125 | Throttle Control Motor Circuit Malfunction | ||||
| P1126 | Magnetic Clutch Circuit Malfunction | ||||
| P1127 | Electronic Throttle Control System Actuator Power Source Circuit Fault | ||||
| P1128 | Throttle Control Motor Lock Malfunction | ||||
| P1129 | Electronic Throttle Control System Fault | ||||
| P1200 (1) | Fuel Pump Relay/ECU Circuit Fault | ||||
| P1300 | Ignitor Circuit Malfunction | ||||
| P1305 | Ignitor Circuit Malfunction | ||||
| P1310 | Ignitor Circuit Malfunction | ||||
| P1315 | Ignitor Circuit Malfunction | ||||
| P1320 | Ignitor Circuit Malfunction | ||||
| P1325 | Ignitor Circuit Malfunction | ||||
| P1330 | Ignitor Circuit Malfunction | ||||
| P1335 | Crankshaft Position (CKP) Sensor "A" Circuit | ||||
| P1340 | Ignitor Circuit Malfunction | ||||
| P1520 (1) | Stoplight Switch Signal Malfunction (A/T Only) | ||||
| P1600 | ECM BATT Malfunction | ||||
| P1633 | ECM Malfunction (Electronic Throttle Control System Circuit) | ||||
| P1780 (1) | Park/Neutral Position (PNP) Switch | ||||
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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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