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Discussion Starter #1
My truck threw the P0420 which is a cat efficiency below threshold. I know i have an exhaust leak cause you can hear it when its cold and i do have another oem manifold and cats on there way.... but im just curious has anyone gotten this code because of the exhaust leak and not the cats being bad??

And yes i have stopped driving the truck until i get the new manifolds installed in fear of sucking cat material into the engine..
 

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An exhaust leak can cause this code.
 

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An exhaust leak can cause this code.
Is this due to the 02 sensors sensing different fuel air mixtures because some of its leaking etc? Sucks not being able to drive the truck, cant decide whether i should drive it until my manifolds come in or not. Like i said got kinda scared off by a couple posts i read about peoples engines sucking in cat material..
 
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