I have a 2015 buick encore with a error code po420n

Jojuked

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I have a buick encore 2015 with a error code po420n has anyone experienced this before and what did you do?
 

Jojuked

New member
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1
Encore
Also i was told to try cataclean first and then maybe unhook my battery for a bit and that may reset the engine light...cause it may just be a clogged catalic converter..muffler?
 
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