How do you install an oxygen sensor in a car?

Answer 1

Locate the O2 sensor, it is the spark plug shaped thing near the top of the Exhaust manifold. Unplug the old wire from the harness, find the correct size wrench (probably a 13/16") Remove the old one. Find some O2 sensor approved RTV sealant or thread locker, apply it to the new threads. Screw in the new one and tighten it up. Plug in the new wire to the harness and you are ready to roll.

-Mr. Mechanic-

Unplug the wire harness, snip off the wires at the old sensor, use a 7/8" box end wrench over the old sensor to break a stubborn sensor loose (CCW), (new sensor has "Never Seize" already applied to threads) install new sensor using a 7/8" open end wrench, tighten (CW) as you would a spark plug (no need to over tighten), plug wire harness back together, done.