Can anyone provide me a walk-through or anything I should know
before attempting this myself...? I have purchased all four replacement
oxygen sensors and my car is almost at 100k miles and I've started
getting the P0420 error code, so I know it's time to change them.

My Bentley Pub manual describes the process as needing to lower
the transmission -- is that really necessary?? I'm hoping not...

Thanks!
Walt

-~