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themetzmeier
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There is a substantially easier way to loosen the driver side post-cat (bank 2 sensor 2 in LH Drive) on a 957 Cayenne S. This method does require 2 people and many extensions for your ratchet but is definitely easier than the methods here. One person needs to lower the ratchet extensions and O2 sensor socket behind the engine to the left of where the O2 sensors are plugged in. The second person needs to grab onto the socket + extensions while laying under the vehicle and guide the socket onto the O2 sensor. From here all you have to do is attach a ratchet and loosen it from the top, takes about 15 minutes compared to the hours wasted trying to loosen it from the bottom with a flex head wrench. Hope this helps someone who was struggling as much as I was to get the torque required to break it loose.