How do you replace egr valve on Mazda 626 v6?

To replace the EGR valve on a Mazda 626 V6, start by disconnecting the negative battery terminal for safety. Remove any necessary components obstructing access to the EGR valve, such as the air intake or vacuum hoses. Unbolt the old EGR valve from its mounting, clean the mounting surface, then install the new valve with a new gasket. Finally, reassemble any removed components, reconnect the battery, and check for proper operation.