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Engine Control System Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Scan Tester Problems Circuit Tests Notes DTC P0100 - Mass Airflow (MAF) Sensor Circuit DTC P0101 - Mass Airflow (MAF) Sensor Circuit Range/Performance Problem DTC P0110 - Intake Air Temperature (IAT) Sensor Circuit DTC P0115 - Engine Coolant Temperature (ECT) Sensor Circuit DTC P0116 - Engine Coolant Temperature (ECT) Sensor Circuit Range/ Performance Problem DTC P0120 - Throttle Position (TP) Sensor Circuit Malfunction DTC P0121 - Throttle Position (TP) Sensor Circuit Range/Performance Problem DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control DTC P0130 - Heated Oxygen Sensor Circuit (Right Side, No. 1), DTC P0150 - Heated Oxygen Sensor Circuit (Left Side) DTC P0133 - Heated Oxygen Sensor (Right Side) Circuit Slow Response DTC P0135 - Heated Oxygen Sensor Circuit (Right Side, No. 1), DTC P0141 - Heated Oxygen Sensor Circuit (Right Side, No. 2), DTC P0155 - Heated Oxygen Sensor Circuit (Left Side) DTC P0136 - Heated Oxygen Sensor Circuit (Right Side, No. 2) DTC P0141 - Heated Oxygen Sensor Circuit (Right Side, No. 2) DTC P0150 - Heated Oxygen Sensor Circuit (Left Side) DTC P0153 - Heated Oxygen Sensor Circuit (Left Side) Slow Response DTC P0155 - Heated Oxygen Sensor Circuit (Left Side) DTC P0171 - System Too Lean (Fuel Trim), DTC P0172 - System Too Rich (Fuel Trim) DTC P0300 - Random Misfire Detected DTCS P0301-P0306 - Cylinders No. 1-6 Misfire Detected DTC P0325 - Knock Sensor No. 1 Circuit, DTC P0330 - Knock Sensor No. 2 Circuit DTC P0335 Or P1335 - Crankshaft Position (CKP) Sensor Circuit DTC P0340 - Camshaft Position (CMP) Sensor Circuit DTC P0401 - Insufficient Exhaust Gas RECIRCULATION (EGR) Flow Detected DTC P0402 - Excessive Exhaust Gas RECIRCULATION (EGR) Flow Detected DTC P0420 - Catalyst System Efficiency Below Threshold DTC P0440 - Evaporative Emission Control System Malfunction DTC P0441 - Incorrect EVAP Purge Flow, DTC P0446 - Vent Control Malfunction DTC P0450 - EVAP Pressure Sensor Malfunction DTC P0500 - Vehicle Speed Sensor Malfunction DTC P0505 - Idle Air Control (IAC) System Malfunction DTC P0510 - Closed Throttle Position (CTP) Switch Malfunction DTC P1300 - IGNITOR Circuit Malfunction DTC P1335 - Crankshaft Position (CKP) Sensor Circuit DTC P1500 - Starter Signal Circuit Malfunction DTC P1600 - ECM Batt Malfunction DTC P1605 - Knock Control CPU Malfunction DTC P1780 - Park/Neutral Position (PNP) Switch