If it locks with the fob in the car if your mazda is locking itself while the fob is in the car without it giving you a loud warning beep then something in the system is not working correctly.
Mazda 3 door handle not working.
One goes to the mazda dealer with your car s vin and tell them what broke and ask what part you should order.
They will show you drawings you point to the part.
If your mazda 3 interior door handle is not working it s usually caused by a bad linkage to the latch.
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It could be that the key fob has lost its charge or possibly that the receiver is acting off.
Just take your time.
First you will need to pry back the door panel so you can access the inside of the door.
Start by removing the two screws that secure the panel to the door.
Order it and install it.