Universal 22mm
Also: for removing stuck sensor cut the wire and use a full 6 pt deepv socket.
On e53, I've always had a high torque impact so I never had to fight. I do use a thread chasing tool to clean up the bunghole.
A couple pics from when i did ones of our 3.0i downstream O₂.
I was trying to find one with the back side crowfoot set-up but this is close with the dr. Seuss around corners ratchet.
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