P0420 Code

Joined
Jul 7, 2005
Messages
236
Location
MA
I got it the other day.
Started the truck up when cold (found that in search)
and I can plainly see an exhaust leak in the flange
between the 2 cats. I'm just going to order the gasket
and replace it as that seems like the cheapest, 99% sure
solution.

Any other thoughts?
 

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