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Originally Posted by cody
Oh yah, you're technically correct Scott. The 02 sensor is in the exhaust manifold right next to the joint of the EM and the UP. You still need an O2 wrench to remove it.
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Yes, the O2 sensor is in the passenger side header.
On every WRX I've worked on, I've made sure to take out the O2 sensor, then take off the lower heatshield and notch the hole in the heatshield so it may be removed/installed w/o having to take out the O2 sensor. Then, everytime the header needs to get dropped, all you have to do is unplug the O2 sensor from the wiring harness and leave it in the header.