I hate failing smog on the borderline

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Well the o2 readings stand around .4%, which I heard it's about right.

The car has 150K on it, I did have a new o2 sensor, but decided not to change it since I heard a bad sensor would kick in the engine light [which i didnt see turn on].

I do agree, a bad 02 sensor would just kill the CAT.
 
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