Once you remove the screw that holds the sensor in place, you have to pull the sensor up. Yes, it is not easy to pull it out. But, you have to pull it out. For installing the new sensor, wet the o-ring with some oil to ease the installation. Be carefull not to break the electrical connector as the connector plastic is more brittle from being old. Do not over tight the screw either. Remember the screw is going into soft aluminum.