P0420 pops up after Header kit install - Power Hungry Performance Forum

		Power Hungry Performance Forum > Ford F-150, Expedition, Navigator, Blackwood, Mark-LT, SVT Lightning and H-D Editions (Disabled) > 2009 to 2014 F-150
P0420 pops up after Header kit install

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2009 to 2014 F-150
3.5L, 3.7L, 4.6L, 5.0L, 5.4L, and 6.2L equipped F-150s.

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Thu, September 30th, 2010, 06:52 PM

jmt0645

semper fi

Join Date: Dec 2009

Location: mobile ,Al

Posts: 45

are they original or aftermarket cats? some aftermarket cat aren't as efficient as OE. (fyi: i have no cats at all and periodically have the same code even with my rear HO2S turned off by bill

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