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.
1999 Lexus SC 300FACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Identification
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC (1) | Description | ||||||
|---|---|---|---|---|---|---|---|
| B2795(2) | Unmatched Key Code | ||||||
| B2796(2) | No Communication In Immobilizer System | ||||||
| B2797(2) | Communication Malfunction No. 1 | ||||||
| B2798(2) | Communication Malfunction No. 2 | ||||||
| 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) Sensor Circuit | ||||||
| P0116 | Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Fault | ||||||
| P0120 | Throttle Position (TP) Sensor Circuit Malfunction | ||||||
| P0121 | Throttle Position (TP) Sensor Circuit Range/Performance Fault | ||||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||||
| P0130 | Heated Oxygen Sensor Circuit Malfunction | ||||||
| P0133 | Heated Oxygen Sensor Circuit Slow Response | ||||||
| P0135 | Heated Oxygen Sensor Heater Circuit | ||||||
| P0136 | Heated Oxygen Sensor Circuit | ||||||
| P0141 | Heated Oxygen Sensor Heater Circuit | ||||||
| P0150 | Heated Oxygen Sensor Circuit Malfunction | ||||||
| P0153 | Heated Oxygen Sensor Circuit Slow Response | ||||||
| P0155 | Heated Oxygen Sensor Heater Circuit | ||||||
| P0156 | Heated Oxygen Sensor Circuit Malfunction | ||||||
| P0161 | Heated Oxygen Sensor Heater Circuit | ||||||
| P0171 | System Too Lean | ||||||
| P0172 | System Too Rich | ||||||
| P0300 | Random Cylinder 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 | ||||||
| P0330 | Knock Sensor | ||||||
| P0335 | Crankshaft Position (CKP) Sensor Circuit | ||||||
| P0340 | Camshaft Position (CMP) Sensor Circuit | ||||||
| P0420 | Catalyst System | ||||||
| P0430 | Catalyst System | ||||||
| P0440 | EVAP System Malfunction | ||||||
| P0441 | Incorrect EVAP Purge Flow | ||||||
| P0446 | EVAP Vent Control Fault | ||||||
| P0450 | EVAP Pressure Sensor Malfunction | ||||||
| P0451 | EVAP Pressure Sensor Range/Performance Fault | ||||||
| P0500 | Vehicle Speed Sensor (VSS) Malfunction | ||||||
| P0505 | Idle Control System Malfunction | ||||||
| P0710(3) | Transmission Fluid Temperature Sensor Fault | ||||||
| P0715(3) | Input/Turbine Speed Sensor Fault | ||||||
| P0750(3) | Shift Solenoid Valve No. 1 Fault | ||||||
| P0753(3) | Shift Solenoid Valve No. 1 Electrical Fault | ||||||
| P0755(3) | Shift Solenoid Valve No. 2 Fault | ||||||
| P0758(3) | Shift Solenoid Valve No. 2 Electrical Fault | ||||||
| P0770(3) | Lock-Up Solenoid Fault | ||||||
| P1120 | Accelerator Position Sensor Circuit Malfunction | ||||||
| P1121 | Accelerator Position Sensor Circuit Malfunction | ||||||
| P1125 | Throttle Control Motor Circuit Malfunction | ||||||
| P1126 | Electromagnetic 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 | ||||||
| P1300 | Ignitor Circuit Malfunction | ||||||
| P1335 | Crankshaft Position (CKP) Sensor Circuit | ||||||
| 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 | ||||||
| P1656 | Oil Control Valve (OCV) Malfunction | ||||||
| P1755(3) | Shift Solenoid Valve SLU Fault | ||||||
| P1760(3) | Shift Solenoid Valve SLT Fault | ||||||
| P1765(3) | Shift Solenoid Valve SLN Fault | ||||||
| P1780 | Park/Neutral Position Switch Malfunction | ||||||
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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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