Ford P0154 OBD-II Trouble Code Definition: P0154 A/F Sensor 21 Heater System Malfunction P0154 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0154 O2 Sensor Circuit No Activity Detected What does the code mean? OBD-ii Code P0154 definition: The oxygen sensors are critical to the engine running properly. It basically informs the PCM (Powertrain Control Module) of […]