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No, you will lose the Freon but you can change it without pulling a vacuum as long as you have the replacement in hand and screw it in while there is still a positive pressure in the system. I have done that without problems. Not good for the environment but you have to do what you gotta do without a vacuum pump handy. If you are lucky it will be a bad connection but it is pretty likely the sensor is bad if the tests in the how-to guides don't pan out.