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 MANUALSTOYOTA1999CELICA 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXENGINE PERFORMANCE DTCS
1999 Toyota Celica 2D Convertible, Standard
Engine Performance DTCS
1999 Toyota Celica 2D Convertible, StandardSECTION Engine Performance DTCS
ENGINE PERFORMANCE DTCS DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | 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 | Oxygen Sensor No. 1 Circuit |
| P0133 | Oxygen Sensor No. 1 Circuit Slow Response |
| P0136 | Oxygen Sensor No. 2 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 |
| P0336 | Crankshaft Position (CKP) Sensor Circuit Range/Performance |
| P0340 | Camshaft Position (CMP) Sensor Circuit |
| P0401 | Insufficient Exhaust Gas Recirculation (EGR) Flow Detected |
| P0402 | Excessive Exhaust Gas Recirculation (EGR) Flow Detected |
| 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 |
| P1300 | Ignitor 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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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.