How can I get my passenger door to open.

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I’m sorry to hear you're having trouble with your Mountaineer. It sounds like your passenger door is likely experiencing a mechanical issue with the door latch or the lock actuator. Since the door won’t open from either the inside or outside, it's possible that the door latch mechanism has failed, or there’s an issue with the linkage inside the door that connects the door handle to the latch. To fix it, the door panel will likely need to be removed to access the locking mechanism and latch. Once inside, you can inspect the mechanism for any broken or disconnected parts, and in some cases, you may need to replace the door latch or the lock actuator. If you’re not comfortable taking the door apart yourself, I recommend having a professional technician handle the repair, especially considering the complexity of removing the panel without damage and diagnosing the latch mechanism. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!