Here's a video I made to highlight a few things about replacing the AOS.
https://youtu.be/WCJ24UCLpZA
Not a full DIY, but some notes.
Disconnect the oil filler tube.
Unbolt the O2 sensor connector from the head.
2002 and earlier models have a rubber hose on the bottom; Position the clamp in an easy place to reach. Use cable style hose clamp pliers.
Clean the intake and throttle body.
Drive the car at highway speed to heat up the catalytic converters and burn out the oil residue.
