Remove the engine room under cover.
(Refer to Engine And Transmission Assembly - "Engine Room Under Cover")
Remove the oil drain plug, and drain the oil into a container.
Disconnect the connector and remove the oil pressure switch (A).
Install in the reverse order of removal.
When installing the oil pressure switch, apply seal lock to the thread.
Seal lock: THREEBOND 2403
Thickness: 0.2 ~ 0.4 mm (0.008 ~ 0.016 in.)