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Re: 04 tribute LX (2WD, 3.0L V6) mechanical ??
A DTC P0420 is usually throw when a catalytic converter is blown, a plugged Cat
would cause Misfires, over heating, and could choke an engine out!
1) Have a muffler shop check your catalytic converter with a back pressure test, it's alot cheaper.
Because of Age + Mileage suspect bad plastic, rubber seals, and gaskets.
A smoke test can pin point vacuum leaks on your Intake, EGR, and PCV systems.
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