July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Knock Sensor (KS) Removal/Installation

Disconnect the negative battery cable.
Remove the intake manifold bracket.
Remove the KS using the SST (49 H018 001).
Install in the reverse order of removal.
Tightening torque
1. 19.6-34.3 N.m {2.0-3.5 kgf.m, 14.5-25.3 ft.lbf}
Fig 1: Identifying Knock Sensor Location
Courtesy of MAZDA MOTORS CORP.