GFunkKid

I, too, know that this is an old thread, but I just replaced mine and thought I'd share a couple tips. - The OEM is Denso. Their product number is DEN234-4603. They call it the "Downstream Cyls. 4-6" sensor for my 2005 GS300. I could tell it was the right sensor, since it clearly has the grommet used where the wire passes into the passenger compartment. - The sensor would not come loose for me. = I used a grinder to cut the sensor itself in half. That allowed me to use a socket. = I bought a 22mm impact wrench socket. Those sockets work by moving the sides of the nuts not the corners, so there was much less danger of rounding, if any. - I still couldn't get the stub of the O2 sensor out of the car. So I jacked the car up and allowed the weight of the car to torque the breaker bar. It worked. - To get the carpet up, remove the plastic panel below the glove compartment. It is held in place by two hooks close to the engine and three hidden clips closer to the passenger seat. Gently push down on the edge closer to the passenger seat. Twist the light to remove it and place the panel to the side. Then you can pull the carpet down to get to the wire. It goes from under the passengers left foot to behind the radio. = The clip is hard to reach. I used my cell phone camera to see what I was trying to do.