Door lock screeching sound Help!

I'm new, hate going to mechanic shop, not knowing what's up. What part should I buy on line? and where should I buy on line?

 

Whats screeching?did you lube anything?

 

The door locks, when I push button, reacts very fast, so something is going out soon.

 

No lube, just contact spray on switches.

 

We can help you more if you articulate well. I still have no idea what’s going on.

 

Likely the actuator. They use gears and an electric motor. Probably the motor is going bad. Common issue on Mazdas. You could try cleaning up the electrical connections to see if it helps, but since this isn't a common problem, my guess is replacement is your best bet.

You could also ignore it. As long as your key still locks/unlocks the door, the only downside of a total failure is inconvenience.

 

Pull the door apart and take a look.