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, 06:29 PM

Longshot270 Longshot270 is offline

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Before or after the cats? Anything past the last sensor doesn't matter. If it is before you have to have a real leak. Many exhaust systems clamp together before anyways I think.

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