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Replace Volkswagen Oxygen Sensor
How do I remove the oxygen sensor? It seems frozen.

   First you need the right 22mm wrench. And now the story from Rajiv: Then he
   explained to me the secret of how he got it off.

   [Applicable to the 1 wire systems attached to the exhaust manifolds ONLY,
   the heat would ruin the catalytic converter, for those mounted on the
   converter]
   The sensor area needs to be heated, either by running and/or torch. Then,
   you spray lots of penetrating oil into the slight crack, where it gets
   sucked in by the pressure drop and by the cooling. This gets the lubricant
   to the threads. (I remember hearing that drilling holes just to the threads
   is a good idea). Keep doing this repeatedly and keep applying the wrench.
   Sooner or later (took them 1 hr) it'll come off.

   There are two types of oxy sensor tools available. The most common
   one looks like a deep socket with a slot on the side, the other
   like a crow foot.
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