Whyi cant get out of park 1996 mercedes 320 3.2 it stuck in park

SOURCE: Brake lights are stuck on all the time. 320 2002 Mercedes

You have a simple plunger switch on the brake pedal. This can be lubricated or replaced. Simple job.

SOURCE: 1996 MERCEDES 320

Even after your car's problem is fixed, the 96s (engine code M104) are notorious for taking an unusually long time to reset the "all clear" in their OBD (on board diagnostic) system. I had to get three 30-day exemptions from the TN agency's top mechanical advisor, who was well aware of this. The car has to drive a crazy drive cycle, which you can find by googling including the OBD2 and "M104 drive cycle" and I will try to find and post it here. As for fixing the original light, go to Autozone or any chain auto parts store, they'll check and reset the light for ya FREE; write down the code and, if necessary, get the prob fixed. Sometimes it's just a loose gas cap, or an intermittent fault that'll not repeat, if you're lucky.