I can shift down to neutral and drive but nothing happens. My car won't move and I can't shift into park. What do you think the problem is? It's a 2002 Ford Taurus...

. Test all under dash and under hood fuses with a test light or multimeter--be very thorough.

. Adjust/replace the Transmission Range Sensor (TRS), located on the transmission:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-6.html#post1955415

Afterwards, drop and clean the pan and magnet, replace the filter, and refill with Mobil 1 Synthetic Multi-Vehicle ATF. By the way, the gasket is reuseable. Do this every 30,000, since ATXs are the weak link in all FWD vehicles.