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.
2002 Lexus IS 300 Base, AutomaticFACTORY 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 Circuit Malfunction |
| P0121 | Throttle (TP)/Pedal Position Sensor Circuit Range/Performance Fault |
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control |
| P0130 OR P0150 | Heated Oxygen Sensor Circuit Malfunction |
| P0133 OR P0153 | Heated Oxygen Sensor Circuit Slow Response |
| P0135 OR P0155 | Heated Oxygen Sensor Heater Circuit |
| P0136 OR P0156 | Heated Oxygen Sensor Circuit Malfunction |
| P0141 OR P0161 | Heated Oxygen Sensor Heater Circuit |
| P0171 OR P0172 | System Too Lean/Rich (Bank No. 1) |
| P0174 OR P0175 | System Too Lean/Rich (Bank No. 2) |
| P0300 | Random Multiple Cylinder Misfire Detected |
| P0301, P0302, P0303, P0304, P0305 OR P0306 | Cylinders No. 1-6 Misfire Detected |
| P0325 OR P0330 | Knock Sensor Circuit Malfunction |
| P0335 | Crankshaft Position (CKP) Sensor "A" Circuit Malfunction |
| P0340 | Camshaft Position (CMP) Sensor Circuit Malfunction |
| P0420 OR P0430 | Catalyst System Efficiency Below Threshold |
| 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 |
| P0550 | P/S Pressure Sensor Malfunction |
| P1120 | Accelerator Pedal Position Sensor Circuit Malfunction |
| P1121 | Accelerator Pedal Position Sensor Circuit Malfunction |
| P1125 | Throttle Control Motor Circuit Malfunction |
| P1126 | Magnetic Clutch 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 Circuit Malfunction |
| P1300 | Ignitor Circuit Malfunction |
| P1335 | Crankshaft Position (CKP) Sensor |
| P1346 | Variable Valve Timing (VVT) Circuit Range/Performance Fault |
| P1349 | 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 | Oil Control Valve (OCV) Circuit Malfunction |
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.