Ford P0419 OBD-II Trouble Code Definition: P0419 Secondary Air Injection System Relay B Circuit Malfunction P0419 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0420 Catalyst System Efficiency Below Threshold What does the code mean? OBD-ii Code P0420 definition: The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and […]