2005 Chrysler Pacifica with engine code P0430. What is bad O2 again or something else?

Question

2005 Chrysler Pacifica 3.5L at 100,000 replaced plugs. Replaced antifreeze had a timing belt and the water pump replaced both o2 sensors with Denso because of mileage. The car runs perfectly. I have a 2004 with 130,000 and the same code and had the converter changed for 500 because it was plugged in. So, the 2005 I bought a walker converter direct replacement for 200 and installed it the code came back a week later with about 400 miles car still ran fine. What is bad o2 again or something else?

Answer 1

P0430 Catakytic efficiency below threshold (Bank 2)

The convertor was plugged? Replacing the 02 sensor is fine using Denso is fine also (certain Chrysler vehicles have 02 sensor that  are propietary ) When you replace the rear 02 sensor with a aged front 02 sensor then this would be a 02 sensor generating P0430.What ever happened to the first catlytic convertor is happening again. What rapidly deteriates a catalytic convertor are mifires, engine problem such as burning oil , coolant loss (where there is a disapearing coolant),

Answer 2

P0430 Chrysler Code - Catalyst Efficiency Bank 2
Read more: https://www.autocodes.com/p0430_chrysler.html