Replace ONE of the rear Oxygen sensors... What a BeeeYatch! They are definitely orig on my '05 3.0 with only 137k miles. And I live in a rusty state.

The sensor just laughed at my O2 sensor socket tool..

We first cut the wire, then cut the sensor with a sawzall to get room for a good deep 22m socket, applied heat from a mapp torch then we cranked and cranked. Finally came out, but left all of its (the sensor's) threads in the hole in the exhaust.

Off to Advanced auto for an $8 O2 sensor thread chaser. It felt like we chasing threads, and not cutting new ones, but try as we might the sensor would not go in perfectly square to the hole...

We have it installed, And I don't have an exhaust leak I can hear, so maybe I am okay.

I am having a shop do the second one.