Catalyst Monitor Execution
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
Catalyst monitor execution is once per drive cycle. Typical monitor duration is 700 seconds. In order for the catalyst monitor to run, the HO2S monitor must be complete and the EVAP system functional with no stored DTCs. If the catalyst monitor does not complete during a particular drive cycle, the already accumulated switch/signal data is retained in the KAM and is used during the next drive cycle to allow the catalyst monitor a better opportunity to complete.