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.
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HOMESERVICE MANUALSLEXUS1998GS 300REPAIR AND DIAGNOSISGENERAL INFORMATIONDTC INDEXENGINE PERFORMANCE DTCS
1998 Lexus GS 300
Engine Performance DTCS
1998 Lexus GS 300SECTION Engine Performance DTCS
ENGINE PERFORMANCE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| P0100 | Mass Airflow (MAF) Sensor Circuit Malfunction |
| P0101 | Mass Airflow (MAF) Circuit Range/Performance Fault |
| P0110 | Intake Air Temperature (IAT) Sensor Circuit |
| P0115 | Engine Coolant Temperature (ECT) Sensor Circuit Fault |
| P0116 | ECT Sensor Circuit Range/Performance Fault |
| P0120 | Throttle Position (TP) Sensor Malfunction |
| P0121 | Throttle Position (TP) Sensor Circuit Range/Performance |
| P0125 | Insufficient Coolant Temperature For Closed Loop |
| P0130 | Heated Oxygen Sensor Circuit Malfunction (Bank 1, Sensor 1) |
| P0133 | Heated Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1) |
| P0135 | Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 1) |
| P0136 | Heated Oxygen Sensor Circuit Malfunction (Bank 1, Sensor 2) |
| P0141 | Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) |
| P0150 | Heated Oxygen Sensor Circuit Malfunction (Bank 2, Sensor 1) |
| P0153 | Heated Oxygen Sensor Circuit Slow Response (Bank 2, Sensor 1) |
| P0155 | Heated Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) |
| P0156 | Heated Oxygen Sensor Circuit Malfunction (Bank 2, Sensor 2) |
| P0161 | Heated Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 2) |
| P0171 | System Too Lean (Fuel Trim) |
| P0172 | System Too Rich (Fuel Trim) |
| P0300 | Random Misfire Detected |
| P0301 | Cylinder No. 1 Misfire Detected |
| P0302 | Cylinder No. 2 Misfire Detected |
| P0303 | Cylinder No. 3 Misfire Detected |
| P0304 | Cylinder No. 4 Misfire Detected |
| P0305 | Cylinder No. 5 Misfire Detected |
| P0306 | Cylinder No. 6 Misfire Detected |
| P0325 | Knock Sensor No. 1 Circuit Malfunction |
| P0330 | Knock Sensor No. 2 Circuit Malfunction |
| P0335 | Crankshaft Position (CKP) Sensor Circuit Malfunction |
| P0340 | Camshaft Position (CMP) Sensor Circuit Malfunction |
| P0420 | Catalyst System Efficiency Below Threshold |
| P0430 | Catalyst System Efficiency Below Threshold |
| P0440 | EVAP System Malfunction |
| P0441 | Incorrect EVAP Purge Flow |
| P0446 | EVAP Vent Control Malfunction |
| P0450 | EVAP Pressure Sensor Malfunction |
| P0451 | EVAP Pressure Sensor Range/Performance |
| P0500 | Vehicle Speed Sensor Malfunction |
| P0505 | Idle Control System Malfunction |
| P1120 | Accelerator Pedal Position (APP) Sensor Circuit Malfunction |
| P1121 | Accelerator Pedal Position (APP) Sensor Range/Performance |
| P1125 | Throttle Control Motor Circuit Fault |
| P1126 | Magnetic Clutch Circuit Fault |
| P1127 | Electronic Throttle Control System (ETCS) Fault |
| P1128 | Throttle Control Motor Lock Fault |
| P1129 | Electronic Throttle Control System (ETCS) Fault |
| P1300 | Ignitor Circuit Malfunction |
| P1335 | Crankshaft Position (CKP) Sensor Circuit |
| P1349 | Variable Valve Timing (VVT) System |
| P1520 | Stoplight Switch Signal Malfunction |
| P1565 | Cruise Control Main Switch Circuit Malfunction |
| P1600 | ECM BATT Malfunction |
| P1633 | ECM Malfunction |
| P1645 | Body ECU Malfunction |
| P1656 | Oil Control Valve (OCV) Circuit Fault |
| P1780 | Park/Neutral Position Switch Malfunction |
RENDER: 1.0x
NO RELATED
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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.