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International Automotive Technicians Network
Re: F150 3.5L Catalyst Failures
Posted to Technical Discussion Forum on 1/10/2024

Deke I would look at the freeze-frame data to see under what conditions the DTC sets. I would also look up the cat-monitor-enable criteria and the DTC-set criteria.

I would be surprised if the monitor is supposed to run during warm-up conditions. Login to read more.