Q: need to replace downstream O2 sensor on 1996 Lincoln Mark VIII

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
need to pass it hard to long does it you need special tool..
(1) Answer
It is mounted after the catalytic converter on the appropriate bank. It may be a bit tough to access, and the threads may be binding or seized. Hard to say until you try. Standard tools are used.

You can find great repair manuals with step-by-step instructions, diagrams, parts locations and other important information for a nominal fee here: