I use a typical crow foot 22mm socket but I put the socket extension in "from the wrong side" and turn righty-loosey.
I used two part 90° defouler but can't seem to find them anymore for sale.
Remove the harmonic isolator that's in the way when working on post cat O₂.
I will pre-twist the cable backwards so I can turn in the sensor ending up no twists.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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