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o2 sensor?

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sorry if this is not the right catagory to put this in but didnt know were to put it..

the truck threw a code today so i went to auto zone. they said it was my o2 senors.. i got dynatech headers and there cats... i also have a pcm 4 less. i was wondering if maybe the pcm wasnt workin right thats y it threw the code or the o2 sensors r messed. how can i check it to c what one it is?

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