Cadillac - OBD Code Lookup

P0420 Cadillac

Catalyst System Low Efficiency Bank 1

Secondary Air Injection System Malfunction

Secondary Air Injection System Insufficient Flow

Secondary Air Injection Solenoid Relay Control Circuit

Secondary Air Injection Pump Relay Control Circuit

Exhaust Gas Recirculation Open Position Performance

Exhaust Gas Recirculation Position Sensor Circuit Low Voltage

Exhaust Gas Recirculation Position Sensor Circuit High Voltage

Ignition Coil 8 Control Circuit

Exhaust Gas Recirculation Flow Malfunction