I recently bought a 2012 sxt plus challenger but it only came with a valet key. I went to two lock smiths who ordered me a fob and push button for the keyless start. They retrieved a PIN number from the car to pair the fob to the car but the pin keeps coming up invalid. They said that the pin had been changed at some point and until I get the right pin they can’t pair the key fob. Does anyone have any idea how I retrieve the right PIN number? Thanks.