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well i got a cel about a month ago right after i installed my exhaust (skunk2 70).

I just got the code scanned at autozone and they said that my 1st(primary) o2 sensor isnt working.

I got a defouler a few days ago but it didnt help any.

so if you guys could help it would be much appreciated.

what could be worng? did i brake the o2 sensor? or is it just my exhaust messing with it?

also, which one is the primary and secondary o2 sensor? is the secondary the one in the cat or the header? :help:
 

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Primary is the one closest to the engine(OEM manifold) & the Secondary is the one in the cat.
 
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