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Originally Posted by unevanoe
Ok so I went to autozone this morning and the codes they gave me were: P0420, P0302, P0401...............If anyone could please help and tell whats going on
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P0420 is for the catalytic convertor
P0302 is cylinder #2 misfire
This could be a little tricky to figure out. You need to figure out what happened first. Could be #2 cylinder started misfiring and took out the convertor or the convertor could have failed and started plugging up and restricting the air flow causing cylinder #2 to misfire. I would start first by checking the coolant level.A failed headgasket could allow coolant into the cylinder making it misfire. Next you will want to remove the front exhaust tube and look into the catalytic convertor to see if it is damaged.