Knock Sensor (KS) Removal/Installation: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
Disconnect the KS connector.
Remove the KS. (See KS Installation Note (SKYACTIV-G 2.0) .) (See KS Installation Note (SKYACTIV-G 2.5) .)

Fig 1: Disconnecting KS Connector
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.