I received this car as my first car and its been great but the OD has always not worked right so I keep it off. When its on, it doesn't shift into 4th gear. When I go over 40mph with OD on, it will not shift into the next gear. Instead it will rev up to 5rpm-3rpm and it never shifts. I don’t know whats wrong exactly but I have been told it could be a transmission sensor issue but im afraid to bring it in and have it checked because I dont have the money for a transmission fix. Any help is appreciated!