Volvo: 2000 S80 non turbo oxygen sensor., changing brakes, oxygen sensors

Question
Hi there Jason. Just found out from Volvo dealer repair shop that my car's check engine light is on because I need to change my front oxygen sensor. I'm pretty handy with tools and do most repair in my car from changing brakes, changing PCV oil trap, changing or cleaning the throttle body and shock absorbers to name a few. I just need the exact location of those front Oxygen sensors and step by step procedure on how to change it myself. I do have tools for most job including the special tool to remove the Oxygen  sensor. Thanks in advance. Have a nice day.

Answer
Ok, this is going to be fun.  First, you'll need to remove the center member by removing the screws and drilling out the rivets.  Then remove the flange between the exhaust pipe and the 3way cat.  Remove the rubber exhaust mount on the rear member.  Pull the rubber pads from the mounting points. Pull the rear exhaust back about 2 inches from the cat.  Remove the front member (more unscrewing and rivet drilling). Unhook the brake pipes and remove the clamps for the cable harnesses.  Lower the rear edge of the three-way cat about 5 inches.  Remove the heat deflector plate.  Remove the left front wheel and separate the connector for the heated oxygen sensor (HO2S). Expose the cable harness and remove the HO2S.  Use the special tool (999 5543) to install the HO2S sensor and tighten to 33ft.lb.  Install and route the harness and connect to the connector.  Install the heat deflector plate.  Install the front member and tighten to 18 ftlb.  Do not reinstall the rivets.  Reinstall the exhaust flange, center member(33 ftlb), and rubber exhaust mounts.  Start engine and check for leaks at flange.
JD