Ford P0418 OBD-II Trouble Code Definition: P0418 Secondary Air Injection System Relay A Circuit Malfunction P0418 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0419 Secondary Air Injection System Control “B” Circuit What does the code mean? OBD-ii Code P0419 definition: The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting […]