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Rear Oxygen Sensor Location

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Is the grommet under the seat or is there a gromment underneath the car?

From what I remember, both. Remove your driver side seat, remove the center console and look down under the carpet from the center console area. You can see a connector near the front right stud for the seat... just follow the wires and you'll find the rear o2 sensor.
 
It literally takes 10 minutes to pull the seat and center console, it isn't that big of a hassle.
 
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