2 things. how do i replace the brake light on my dodge nitro and 2. the passenger air bag light is on happen to know why??

The vehcle has what called advanced qirbag system. It has weight sensors on the passenger front seat. This is for if you have a small child undeer 30 pounds in the front seat the airbags will not deploy. Try sitting in the seat with the car running if the light go out that is why. If it does not have the dealer recalbrate the weight sensors. P.S. don't put small this on the seat like boxes or books that will throw the calibration off. hope this helps.