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Engine Control System Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Programming Scan Tool Problems Summary Diagnostic Trouble Code Definitions Diagnostic Tests Notes DTC P0100: Mass Airflow Meter Circuit DTC P0101: Mass Airflow Meter Circuit Range/Performance DTC P0110: Intake Air Temperature Sensor Circuit DTC P0115: Engine Coolant Temperature Sensor Circuit DTC P0116: Engine Coolant Temperature Sensor Circuit Range/Performance DTC P0120: Throttle Position Sensor Circuit DTC P0121: Throttle Position Sensor Circuit Range/Performance DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control DTC P0128: Thermostat Malfunction DTC P0136: Heated Oxygen Sensor Circuit (Bank No. 1, Sensor No. 2) DTC P0141: Heated Oxygen Sensor Heater Circuit (Bank No. 1, Sensor No. 2) DTC P0156: Heated Oxygen Sensor Circuit (Bank No. 2, Sensor No. 2) DTC P0161: Heated Oxygen Sensor Heater Circuit (Bank No. 2, Sensor No. 2) DTC P0171: System Too Lean (Bank No. 1), Or P0172: System Too Rich (Bank No. 1) DTC P0174: System Too Lean (Bank No. 2), Or P0175: System Too Rich (Bank No. 2) DTC P0300: Random Misfire Detected DTCS P0301-P0304: Cylinders No. 1-4 Misfire Detected DTC P0325: Knock Sensor Circuit DTC P0335 Or P1335: Crankshaft Position Sensor Circuit DTC P0340: Camshaft Position Sensor Circuit DTC P0420: Catalyst System Efficiency Below Threshold (Bank No. 1) DTC P0430: Catalyst System Efficiency Below Threshold (Bank No. 2) DTC P0440: Evaporative Emission Control System DTC P0441: Incorrect EVAP Purge Flow, Or DTC P0446: EVAP Vent Control Malfunction DTC P0450: EVAP Pressure Sensor Circuit, Or DTC P0451: EVAP Pressure Sensor Range/Performance DTC P0500: Vehicle Speed Sensor Circuit DTC P0505: Idle Control System Malfunction DTC P1133: Air/Fuel Sensor Circuit Response Malfunction (Bank No. 1, Sensor No. 1) DTC P1135: Air/Fuel Sensor Heater Circuit (Bank No. 1, Sensor No. 1) DTC P1153: Air/Fuel Sensor Circuit Response Malfunction (Bank No. 2, Sensor No. 1) DTC P1155: Air/Fuel Sensor Heater Circuit (Bank No. 2, Sensor No. 1) DTC P1300: IGNITOR No. 1 Circuit DTC P1305: IGNITOR No. 2 Circuit DTC P1310: IGNITOR No. 3 Circuit DTC P1315: IGNITOR No. 4 Circuit DTC P1335: Crankshaft Position Sensor Circuit DTC P1346: Variable Valve Timing Sensor Circuit Range/Performance DTC P1349: Variable Valve Timing System Malfunction DTC P1520: Stoplight Switch Signal Circuit DTC P1600: Engine Control Module Batt Circuit DTC P1656: Oil Control Valve Circuit Malfunction DTC P1780: Park/Neutral Position Switch Circuit