01 Pontiac Grand Am service engine light catalytic converter?

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have 01 pontiac grand se 2.4l 4 cyl. automatic. service engine light on. code says catalytic inefficiency or catalytic efficiency low. car has o2 sensor in front , behind cat. can trick o2 sensor? or better option, if put after market cat in check engine light or service engine light stay on or off??

i have 01 pontiac grand se 2.4l 4 cyl. automatic. service engine light on. code says catalytic inefficiency or catalytic efficiency low. car has o2 sensor in front , behind cat. can trick o2 sensor? or better option, if put after market cat in the...


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