1. Remove the air filter.
2. Inspect the air filter.
Note

Air filter removal/installation
A/c unit removal/installationMazda 6 Service Manual: Transmitter
NOTE
(With theft-deterrent system) The hazard warning lights flash
when the theft-deterrent system is armed or turned off. Refer to Theft-Deterrent
System.
(With the advanced keyless function) A beep sound can be heard
for confirmation when the doors are locked/ unlocked using the k ...
Mazda 6 Service Manual: Locking, Unlocking the Doors
NOTE
The system may not operate if you are too close to the windows or door
handles.
If the key is left in the following areas and you leave the vehicle,
the doors may be locked depending on the radio wave conditions even if the key
is left in the vehicle.
Around the dashboard
...