1. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Remove the battery and battery tray..
4. Remove the following parts..
Fresh-air duct
Air cleaner
Charge air cooler
Air hose
Air duct
5. Set the throttle body out of the way..
6. Remove the EGR pipe.

7. Install in the reverse order of removal.
Check Valve (Two Way) Removal/Installation [Mzr 2.0, Mzr 2.5]
EGR Valve Inspection [Mzr 2.0, Mzr 2.5]Contact Authorized Mazda Dealer and Have Vehicle Inspected
If any of the following warning lights or the indicator light turns on/flashes, the system may
have a malfunction. Contact an Authorized Mazda Dealer to have your vehicle
inspected.
...
EGR Valve Inspection [Mzr 2.0, Mzr 2.5]
Resistance Inspection
1. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Disconnect the EGR valve connector.
4. Measure the resistance between the EGR valve terminals.
EGR valve terminal
Resistance inspection (ohm)
...
Dehumidifying (With air
conditioner)
Operate the air conditioner in cool or cold
weather to help defog the windshield and
side windows.
Set the mode selector dial to the desired
position.
Set the air intake selector to the outside
air position.
Set the temperature control dial to the
desired position.
Set the fan cont ...