Even after replacing the spark plugs, camshaft sensor, and cleaning the throttle body, my 2014 Peugeot 301 is still having trouble starting. Any ideas on what could be the issue?

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?