My auto wipers are also pretty terrible. Sometimes when I get into the car it will go into max speed mode with only a few drops on the windshield. When I'm driving, it has never wiped fast enough. It seems like the speed in auto mode is somewhere between the first and second manual setting - which is not enough in the rain. I always have to manually adjust the speed setting to 2 or 3. Just had a mobile ranger come out last week and he said if there's an issue with the sensor they'll have to replace the entire windshield because it's permanently glued on.