When replacing the sensor, using an anti-seize compound is a good idea. Use a light coat applied to the threads. LIGHT is the key word. Avoid getting the compound on the sensing element as the burning graphite can cause false readings.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now