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Re: F150 3.5L Catalyst Failures
Posted to Technical Discussion Forum on 1/9/2024

I have graphed 02 sensors on cars that set P0420 when hot and don't look bad. Then I graph from a cold start and see how long till the cat comes to life. I start it and rev it to 2500 RPM and many times it is like 5 minutes before they are working. Good cats a... Login to read more.