Removing and installing Mazda 3 speedometer sensor
Disconnect the negative battery cable.
Remove the battery and its tray.

The operation of the Anti-Lock Brake System (ABS/TCS) or DSC On-Board Diagnostics is essentially the same as the previous 323 (BJ), with the following exceptions:
- - diagnostic codes, PID data monitor functions and active commands functions have been changed;
- - removed TBS pin of DLC connector;

Air filter
The car is equipped with an air filter that can deodorize the air and purify it from pollen and dust.
The air filter consists of a deodorizer surrounded by a dust filter.

Put the car on a level surface, jack it up and lower it onto stands.
Drain the gearbox oil (see Mazda 3 gearbox oil change).