Category: OBDii Powertrain Codes

P0420 Catalyst System Efficiency Below Threshold Bank 1 Possible causes – Three way catalyst converter Bank 1– Exhaust tube– Intake air leaks– Fuel injectors may be faulty– Fuel injector leaks– Spark plugs may be faulty– Improper ignition timing– Engine Control Module (ECM) Tech description As the code description implies the P0421 code means that the…

P0421 Warm Up Catalyst Efficiency Below Threshold Bank 1 Possible causes – Warm Up Three Way Catalytic converter deterioration or malfunction– Exhaust system leaks– Loose front or rear HO2Ss– Faulty front heater O2 sensor– O2 sensors harness is open or shorted– O2 sensors poor electrical connection Tech description As the code description implies the P0421…

P0423 Heated Catalyst Efficiency Below Threshold Bank 1 Possible causes – Air leak before catalytic converter – Faulty oxygen sensor– Faulty Catalytic Converter Tech description As the code description implies the P0423 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as…

P0424 Heated Catalyst Temperature Below Threshold Bank 1 Possible causes – Air leak before catalytic converter – Faulty oxygen sensor– Faulty Catalytic Converter Tech description As the code description implies the P0424 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as…

P0414 Secondary Air Injection System Switching Valve A Circuit Shorted Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0414 is detected the the AIR vacuum control solenoid circuit not operating as desired by the…

P0415 Secondary Air Injection System Switching Valve B Circuit Malfunction Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0415 is detected the the AIR vacuum control solenoid circuit not operating as desired by the…

P0415 Secondary Air Injection System Switching Valve B Circuit Malfunction Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0415 is detected the the AIR vacuum control solenoid circuit not operating as desired by the…

P0416 Secondary Air Injection System Switching Valve B Circuit Open Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0416 is detected the the AIR vacuum control solenoid circuit not operating as desired by the…

P0417 Secondary Air Injection System Switching Valve B Circuit Shorted Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0417 is detected the the AIR vacuum control solenoid circuit not operating as desired by the…

P0418 Secondary Air Injection System Relay A Circuit Malfunction Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0418 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM….

P0419 Secondary Air Injection System Relay B Circuit Malfunction Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0419 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM….

P0412 Secondary Air Injection Switchover Solenoid Circuit Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0412 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM. Symptoms –…

P0413 Secondary Air Injection System Switching Valve A Circuit Open Possible causes – Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection What about the obd code? The DTC P0413 is detected the the AIR vacuum control solenoid circuit not operating as desired by the…

P0406 Exhaust Gas Recirculation Temperature Sensor Circuit High Input Possible causes – EGR Valve clogged, dirty or leaky– EGR valve damaged/defective– EGR volume control solenoid valve– EGR temperature sensor and circuit– EGR volume control solenoid valve harness is open or shorted– EGR volume control solenoid valve circuit poor electrical connection What about the obd code?…

P0407 Exhaust Gas Recirculation Sensor B Circuit Low Possible causes – EGR volume control solenoid valve– EGR volume control solenoid valve harness is open or shorted – EGR volume control solenoid valve circuit poor electrical connection– EGR temperature sensor and circuit What about the obd code? An improper voltage signal is sent to ECM through…

P0408 Exhaust Gas Recirculation Sensor B Circuit High Possible causes – EGR volume control solenoid valve– EGR volume control solenoid valve harness is open or shorted – EGR volume control solenoid valve circuit poor electrical connection– EGR temperature sensor and circuit What about the obd code? An improper voltage signal is sent to ECM through…

P0409 Exhaust Gas Recirculation (EGR) (Sensor A) Circuit Malfunction OBD Code: System: Subsystem:  P0409 – (ASE)  Powertrain  Auxiliary Emission Controls Trouble Code Description: Exhaust Gas Recirculation (EGR) (Sensor A) Circuit Malfunction Location: Analysis: Possible Causes:  Sensor A  Circuit Malfunction   Tech description: