3 screws :P

i unscrewed the whole back thing fro the metal housing when i cleaned it

im talkin about the screws that are on either side of the connector, some people cant figure out how to remove the connector so they unscrew the whole thing and out comes a bunch of wires and it messes it all up

get an air gun with compressed air and carefully blow the sensor with air...be very carefull as too much air pressure will harm it....blow specially in the small oriffice... I did the same thing and it worked great afterwards.....

there is fluid still trapped in the small holes of the sensor.....