As a last resort you can try and get some vise-grips on the sensor and remove it that way. I suggest you get a mirror and a flashlight and take a better look at it. The flat faces on the sensor are rounded on the sides so it makes it tougher to grab on to it. Also, if you remove the carb airbox, you can get a better look at the sensor from the driver's side of the engine. Then you can tell if it is stripped or not. A good flashlight is a life saver in this task. I think your best bet is to buy/borrow a 24 mm socket and remove the sensor with it. I used a crescent wrench, and it was a bit tough to get it adjusted just right so it grabbed the sensor. Once you break it loose, you can remove it mostly by hand.
P.S.: If you can get a helper, have them observe what you are doing from the driver's side of the engine. They can tell you if your wrench is adjusted correctly, and if you need to move your hand to get the wrench to line up.
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