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I just bought 2013 patriot latitude about a months ago. The dealer have changed the catalytic converter and a o2 sensor for me. Today on my short trip the engine light on. I went to autozone for them what's the code for and they said P0420. My question is how to fix this code when I just get catalytic converter and sensor replacement. Please help 馃檹
 

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If it were me I'd go back to the dealer that replaced the cat / o2 sensor and discuss it with them.

That said here's the info from the service manual:

94393

94394
 

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2014 Sport 4X4 FD2 Off-road, Falken Wildpeak A/T, All weather & convienance group, EVIC, ATC, Hitch
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Definitely take it back
 
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