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 Toyota Corolla LE, AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC (1) | Description | ||||
|---|---|---|---|---|---|
| P0105 | Manifold Absolute Pressure (Map)/Barometric Pressure Sensor Circuit | ||||
| P0106 | Manifold Absolute Pressure (Map)/Barometric Pressure Sensor Circuit Range/Performance | ||||
| P0110 | Intake Air Temperature (IAT) Sensor Circuit | ||||
| P0115 | Engine Coolant Temperature (ECT) Sensor Circuit | ||||
| P0116 | Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance | ||||
| P0120 | Throttle Position (TP) Sensor Circuit | ||||
| P0121 | Throttle Position (TP) Sensor Circuit Range/Performance | ||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||
| P0130 | Heated Oxygen Sensor No. 1 Circuit | ||||
| P0133 | Heated Oxygen Sensor No. 1 Circuit Slow Response | ||||
| P0135 | Heated Oxygen Sensor No. 1 Heater Circuit | ||||
| P0136 | Heated Oxygen Sensor No. 2 Circuit | ||||
| P0141 | Heated Oxygen Sensor No. 2 Heater Circuit | ||||
| P0171 | System Too Lean | ||||
| P0172 | System Too Rich | ||||
| 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 | ||||
| P0325 | Knock Sensor Circuit | ||||
| P0335 | Crankshaft Position (CKP) Sensor Circuit | ||||
| P0340 | Camshaft Position (CMP) Sensor Circuit | ||||
| P0420 | Catalyst System Efficiency Below Threshold | ||||
| P0440 | Evaporative Emission Control System (EVAP) | ||||
| P0441 | Incorrect EVAP Purge Flow | ||||
| P0446 | EVAP Vent Control Circuit | ||||
| P0450 | EVAP Pressure Sensor Circuit | ||||
| P0451 | EVAP Pressure Sensor Range/Performance | ||||
| P0500 | Vehicle Speed Sensor Circuit | ||||
| P0505 | Idle Air Control (IAC) System Circuit | ||||
| P0750 (2) | Shift Solenoid Valve No. 1 Malfunction | ||||
| P0753 (2) | Shift Solenoid Valve No. 1 Electrical Malfunction | ||||
| P0755 (2) | Shift Solenoid Valve No. 2 Malfunction | ||||
| P0758 (2) | Shift Solenoid Valve No. 2 Electrical Malfunction | ||||
| P0770 (2) | Lock-Up Solenoid Malfunction | ||||
| P0773 (2) | Lock-Up Solenoid Circuit Electrical Malfunction | ||||
| P1300 | Ignitor No. 1 Circuit | ||||
| P1310 | Ignitor No 2. Circuit | ||||
| P1335 | Crankshaft Position (CKP) Sensor Circuit | ||||
| P1520 | Stoplight Switch Signal Circuit (A/T Only) | ||||
| P1600 | ECM BATT Circuit | ||||
| P1780 | Park/Neutral Position (PNP) Switch Circuit | ||||
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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.