Q: Computer reads accelerator pedal sensor when it has already been replaced.

The transmission was having problems shifting up & down. I added a small amount of transmission fluid. It threw an engine light on. the following day not one issue, engine light turned off. Next day it began acting up again after it had been on the road for about 15 minutes, engine light back on. Mechsnic replaced oil sending unit sensor. 30 minutes later it breaks down & needs jumped. It made it home only running above 2500 RPMS. The following day it went back to the same mechanic. Not one issue on the way there. Mechanic tells me he is "confident" he found the problem and shows me a cracked crank shaft sensor that he replaced. Not even 10 minutes & it starts acting up. Dying this time. FOOT to floor and it limped off the road. Towed it home. Computer reads accelator pedal. Found one at junk yard bc it's backordered with mopar and it still reads the same thing. Is it possible to have received a bad pedal from a junk yard? Or another sensor possibly?

My car has 208000 miles.
My car has an automatic transmission.