What could be the reasons when the vehicle displays "no key" and won't start?

I disassembled the Peugeot 301 key and moved the chip to a new case, with the metal key separate. Now, the remote can unlock the door, but the metal key won't start the car. Could it be the key issue that's causing the car not to start?

The trunk suddenly won't open, and it's showing that the trunk is unlocked. What could be the reason?

4WD light is flashing, and the vehicle won't start.

What could be the reason that the MG ZS won't start with the push button?

What could be the reason that when I press the key, the car doesn't respond and the doors won't open?

When the vehicle just starts, there's a whistling sound from the front wheels, but it disappears after driving for a while. What's the reason? Could it be that a small stone got into the brake disc?

What could be the reasons when the vehicle displays "no key" and won't start?

The engine won't start, and the EPC, battery, and engine fault lights on the dashboard are all on. What could be the reason?

The car won't start, and the EPC, battery, engine, and malfunction indicator lights are all on. What could be the reason?

The 2020 Nissan X-Trail sometimes has a start-stop malfunction when starting the car. What could be the reason for this?!!!