2004 - 2008 F-150

Oxygen Sensor and Cat

Old 07-13-2019, 03:01 AM
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Oxygen Sensor and Cat

I just recently received a few codes on my 2007 F150 5.4 that only pertained to the oxygen sensors. I drove a few days with the check engine light on and had loss of power. I stopped driving and changed oxygen sensors. Drives better, but I have noticed a guttering sound and am getting a cylinder 1 misfire. Is my passenger side cat clogged or is it something beyond that?
Old 07-13-2019, 08:34 AM
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When was the last time the plugs were changed?

If you think you have a clogged cat, you can test the back pressure using an exhaust back pressure test kit.
Old 07-13-2019, 11:29 AM
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What were the exact P-codes?

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