Ford Expedition Evap and catalytic converter not sending ready code with P0135 on Ford Expedition

Some Ford Expedition owners report experiencing issues with the Evaporative Emission Control System (EVAP) and catalytic converter not sending a ready code, alongside the P0135 trouble code. These problems can indicate that the EVAP system is failing to monitor fuel vapor leaks effectively, which is crucial for preventing pollution. Additionally, a 'not ready' notification from the catalytic converter monitor suggests potential issues with the converter itself. The P0135 trouble code points to a malfunction in the O2 sensor heater circuit in bank 1, sensor 1, located before the catalytic converter. Factors such as incomplete drive cycles, unmet pretest conditions, or a failing PCM may contribute to these readiness issues. Some owners find it necessary to clear the P1000 code under specific conditions to allow the EVAP monitor to function correctly. It is vital for owners to ensure that all non-continuous monitors have completed their tests using a scan tool to accurately diagnose the readiness status of the EVAP system and catalytic converter.