Possible causes – Air leak before catalytic converter – Faulty oxygen sensor– Faulty Catalytic Converter Tech notes 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

Possible causes – Air leak before catalytic converter – Faulty oxygen sensor– Faulty Catalytic Converter Tech notes 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

Possible causes – Boost pressure sensor harness is open or shorted– Boost pressure sensor circuit poor electrical connection– Faulty boost pressure sensor– Faulty Turbo/Super Charger– Engine over temperature– Ignition misfire exceeds the calibrated threshold– Faulty Knock sensor (KS) When is

Possible causes – Boost pressure sensor harness is open or shorted– Boost pressure sensor circuit poor electrical connection– Faulty boost pressure sensor– Faulty Turbo/Super Charger– Engine over temperature– Ignition misfire exceeds the calibrated threshold– Faulty Knock sensor (KS) When is

Possible causes – Check Quantity Adjuster– Check Modulator Piston Displacement Sensor Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Check Quantity Adjuster– Check Modulator Piston Displacement Sensor– Check Cold Start Injector– Check Needle Lift Sensor Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Dirty engine oil– Camshaft Position Actuator Circuit is open or shorted– Camshaft Position Actuator Circuit poor electrical connection– Faulty Camshaft Actuator Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Dirty engine oil– Camshaft Position Actuator Circuit is open or shorted– Camshaft Position Actuator Circuit poor electrical connection– Faulty Camshaft Actuator Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Dirty engine oil– Faulty Camshaft Actuator– Camshaft Position Actuator harness is open or shorted– Camshaft Position Actuator circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Lack/Loss of power– Engine rough

Possible causes – Dirty engine oil– Faulty camshaft actuator– Low engine oil level– Camshaft actuator harness is open or shorted– Camshaft actuator circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Possible Lack/Loss of

Possible causes – Dirty engine oil– Low engine oil level– Camshaft actuator circuit open or shorted– Camshaft actuator circuit poor electrical connection– Faulty camshaft actuator Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Dirty engine oil– Low engine oil level– Camshaft actuator circuit open or shorted– Camshaft actuator circuit poor electrical connection– Faulty camshaft actuator Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Dirty engine oil– Low engine oil level– Camshaft actuator circuit open or shorted– Camshaft actuator circuit poor electrical connection– Faulty camshaft actuator Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Lack/Loss of power– Engine

Possible causes – Dirty engine oil– Low engine oil level– Faulty camshaft actuator– Camshaft actuator circuit open or shorted– Camshaft actuator circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Lack/Loss of power– Engine

Possible causes – Dirty engine oil– Low engine oil level– Faulty camshaft actuator– Camshaft actuator circuit open or shorted– Camshaft actuator circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Lack/Loss of power– Engine

Possible causes – Dirty engine oil– Low engine oil level– Faulty camshaft actuator– Camshaft actuator harness is open or shorted– Camshaft actuator circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Lack/Loss of power–

Possible causes – Dirty engine oil– Low engine oil level– Faulty camshaft actuator– Camshaft actuator harness open or shorted– Camshaft actuator circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Lack/Loss of power– Engine

Possible causes – Dirty Fuel Injector 1– Faulty Fuel Injector 1– Plugged Fuel Injector 1– Fuel injector 1 harness is open or shorted– Fuel injector 1 circuit poor electrical connection Tech notes Clogged or partially clogged fuel injector can cause

Possible causes – Dirty Fuel Injector 1– Faulty Fuel Injector 1– Plugged Fuel Injector 1– Fuel injector 1 harness is open or shorted– Fuel injector 1 circuit poor electrical connection Tech notes Clogged or partially clogged fuel injector can cause

Possible causes – Dirty Fuel Injector 1– Faulty Fuel Injector 1– Plugged Fuel Injector 1– Fuel injector 1 harness is open or shorted– Fuel injector 1 circuit poor electrical connection Tech notes Clogged or partially clogged fuel injector can cause