What is the reason for the red key exclamation mark appearing on Mazda?

[StIsla]

Mazda displays a red key exclamation mark because the car cannot detect the key. It is recommended to check whether the key is broken or the battery is dead. Solutions: If the key is broken, you can reprogram a new chip; if the key battery is dead, simply replace the battery. Method for replacing the key battery: Use a screwdriver to pry open the plastic shell of the key at the reserved notch or gap; use a thicker needle to remove the key battery, paying attention to the positive and negative positions of the battery when removing it; after removing the old battery, install the new battery, making sure not to reverse the positive and negative poles; reassemble the key shell and mechanical teeth in the reverse direction to restore them to their original position.