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.
Diagnostic Trouble Code (DTC) Identification
See DTC IDENTIFICATION table, then go to appropriate diagnostic procedure in DIAGNOSTIC TESTS. Repair condition which set DTC(s), beginning with lowest number first, then in ascending order.
| Code | Probable Cause |
|---|---|
| P0102 | Mass Airflow (MAF) Circuit Input Low |
| P0103 | Mass Airflow (MAF) Circuit Input High |
| P0112 | Intake Air Temperature (IAT) Circuit Input Low |
| P0113 | Intake Air Temperature (IAT) Circuit Input High |
| P0116 | Engine Coolant Temperature (ECT) Sensor Range |
| P0117 | Engine Coolant Temperature (ECT) Sensor Input Low |
| P0118 | Engine Coolant Temperature (ECT) Sensor Input High |
| P0121 | Throttle Position (TP) Sensor Range |
| P0122 | Throttle Position (TP) Sensor Input Low |
| P0123 | Throttle Position (TP) Sensor Input High |
| P0130 | HO2S Circuit Malfunction (Front) |
| P0131 | HO2S Circuit Voltage Low (Front) |
| P0132 | HO2S Circuit Voltage High (Front) |
| P0133 | HO2S Circuit Slow Response (Front) |
| P0134 | HO2S Circuit No Activity (Front) |
| P0135 | HO2S Heater Circuit Malfunction (Front) |
| P0136 | HO2S Circuit Malfunction (Rear) |
| P0137 | HO2S Circuit Voltage Low (Rear) |
| P0138 | HO2S Circuit Voltage High (Rear) |
| P0141 | HO2S Heater Circuit Malfunction (Rear) |
| P0201 | Injector No. 1 Circuit Malfunction |
| P0202 | Injector No. 2 Circuit Malfunction |
| P0203 | Injector No. 3 Circuit Malfunction |
| P0204 | Injector No. 4 Circuit Malfunction |
| 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 |
| P0326 | Knock Sensor Range |
| P0335 | Crankshaft Position (CKP) Sensor Malfunction |
| P0336 | Crankshaft Position (CKP) Sensor Range |
| P0342 | Camshaft Position (CMP) Sensor Input Low |
| P0343 | Camshaft Position (CMP) Sensor Input High |
| P0422 | Main Catalyst Efficiency Below Threshold |
| P0441 | EVAP Purge Valve Permanently Open |
| P0442 | EVAP System Leak Detected |
| P0443 | EVAP System Purge Control Valve Circuit Malfunction |
| P0444 | EVAP System Purge Control Valve Circuit Open |
| P0445 | EVAP System Purge Control Valve Circuit Shorted |
| P0446 | EVAP Vent Control Valve Malfunction |
| P0447 | EVAP Vent Valve Short To Ground |
| P0448 | EVAP Vent Valve Short To Voltage |
| P0451 | Fuel Tank Pressure Sensor Signal Not Plausible |
| P0452 | Fuel Tank Pressure Sensor Signal Low |
| P0453 | Fuel Tank Pressure Sensor Signal High |
| P0455 | EVAP System Incorrect Purge Flow |
| P0501 | Vehicle Speed Sensor (VSS) Range |
| P0506 | Idle RPM Lower Than Expected |
| P0507 | Idle RPM Higher Than Expected |
| P1123 | Long Term Fuel Trim Additive Air, System Too Rich |
| P1124 | Long Term Fuel Trim Additive Air, System Too Lean |
| P1127 | Long Term Fuel Trim Multiplicative, System Too Rich |
| P1128 | Long Term Fuel Trim Multiplicative, System Too Lean |
| P1510 | Idle Control Valve Opening Coil Circuit Shorted |
| P1513 | Idle Control Valve Opening Coil Circuit Open |
| P1552 | Idle Control Valve Closing Coil Circuit Shorted |
| P1553 | Idle Control Valve Closing Coil Circuit Open |
| P1605 | Rough Road Sensor Circuit Malfunction |
| P1606 | Rough Road Sensor Signal Not Rational |
| P1611 | MIL Request Signal Circuit Input Low |
| P1613 | MIL Request Signal Circuit Input High |
Use the Manual With the Right Hardware
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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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