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Ok I feel like a noon asking but how do you replace/remove the secondary o2 sensor at the cat? I'm putting on a whole new exhaust and the o2 sensor goes up into the cabin. How do you replace this sensor when the wire plug won't fit through the grommet in the floorboard? Am I missing something?

The old o2 sensor was frozen in the pipe so I just cut the wires to remove the old one. But now how do I get the new wire through the grommet?
 

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Put the sensor through the hole from inside
 

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I'm an idiot. The new 02 sensor I got was the oem one. It has the grommet already on the wire so walk I have to do is unplug the harness and remove the old grommet. Then replace with new sensor, run wire into cabin and pop in the new grommet. Wow what a de de de moment. I need sleep. Lol

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