In order to get working room, you need to remove the blow off valve and the hose that connects to the turbo.
First, remove the hose clips with some pliers and then remove the hose and valve with a good amount of twisting.
|Now you should be able to see the sensor. There is a small cover over the sensor that is held on with one Torx screw.
To make life easier I sprayed the screw with some rust penetrating spray. I'm not sure if it did anything, but it can't hurt!
Using the ratchet with a swivel, remove the screw and the cover.
Pull the sensor out of the block and then follow the wire to the plug. You should find that the wire is held on with a metal clip.
Make a note of where this clip is and then pull it off by using a long screwdriver to lift it off of the pipe.
Next, locate the actual plug. For my 2001 9-5, it was in the same spot as the two oxygen sensors, right near the throttle body. Using a small screwdriver, separate the plug by pulling out the red tab of the plug. Now you can remove the sensor.
Remove the old sensor and install the new one.
Run the new sensor along the same path as the old one and plug it back in to the harness.
Now attach the wire clip close to where you removed it and push the sensor back into the block.
Lining up the screw can be a small challenge, so use your fingers until the screw catches the threads. Now, tighten the screw down until hand tight.
Reinstall the blow off valve and hose and start up the car. If you did it right, the car should start and run with no Check Engine Light!