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Sup guys I changed my catalytic about 350 miles ago but for some reason it’s not reading my bottom sensor this causing smog to fail any pointers I can get to make sure my catalytic is working properly ? To get a good read
 

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O2 sensors are pretty sensitive to impacts. Maybe it got banged around when the cat was changed.

First thing I would do is replace the sensor and see if that fixes it.
 
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