Hey all, bought a used MX last week but one of the keys doesn't work at all. I understand that even without a battery inside if you place the key at the bottom of the rear door it should unlock the car and placing the key under the 12v socket will start the car but none of these things work and I have to use my phone to do those things which is quite annoying. Is there anything I could try before paying £130 for tesla to provide a new one? Thanks