The sport mode holds the transmission in each gear a little longer than usual allowing you to accelerate more quickly at the expense of lower fuel mileage. The P38 is always in 4wd. To select low range, slow almost to a stop, select neutral and then move the shift lever to the right.

If you didn't get an owners manual with the vehicle you should go buy one.

Check the sunroof drain tubes. The best way to clear them is to blow them out with compressed air.