if im thinkin correctly the housing comes right off..the same housing for the thermostat..take the housing off and replace it with another one..or take it off and a shop should be able to get it out for you if you cant do it yourself..
it basically broke clean off level with where it screws in at....maybe an easy out?
Worth a try. If it sheared off from an over-torque as opposed to corrosion, it should be removable this way...Just be careful and use high quality metal bits, driven pneumatically if you can. Last thing you want is to get into the sensor and then break a drill bit tip off in your new hole. Go slow don't harden the metal.
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