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If I remember correctly there is an O-ring that can be a little sticky, so, if you can twist it, you should be able to reach in there with a standard screwdriver and be able to pry between the sensor and the block, should be able to get a putty knife under it to help a little, keep from chewing up the edge of the sensor. Now, since these sensors tend to be sensitive when it comes to quality, be for darned sure you use a factory replacement sensor, not an aftermarket unit, not eve a NAPA part. There are several of us that have replaced sensors that weren't factory units and had problems and error codes that were erroneous, and the errors tend to go away after switching back to factory sensors. The extra $15 for the factory part, had I known this, would have saved me about a grand in verifying a check engine light was not real.