Heated Oxygen Sensor (Ho2S) And Catalyst Monitor Sensor Removal/Installation - 3.0L

Fig 1: Heated Oxygen Sensor (HO2S) And Catalyst Monitor Sensor Replacement Components - 3.0L With Torque Specifications

Courtesy of MAZDA MOTORS CORP.

ITEM DESCRIPTION CHART

1	Heated oxygen sensor (HO2S) and catalyst monitor sensor electrical connectors
2	HO2S and catalyst monitor sensor wiring retainers (3 required)
3	HO2S and catalyst monitor sensors

1. With the vehicle in NEUTRAL, position it on a hoist. See LIFTING .
   Fig 2: Locating LH Splash Shield Bolts

   Courtesy of MAZDA MOTORS CORP.
2. Remove the 7 bolts (5 shown) and the LH splash shield.
   • To install, tighten to 10 N.m {1.0 kgf.m, 89 in.lbf}.
3. Disconnect the heated oxygen sensor (HO2S) and the catalyst monitor sensor electrical connectors.
   Fig 3: Identifying Special Tool (303-476)

   Courtesy of MAZDA MOTORS CORP.
4. Using the special tool, remove the HO2S and the catalyst monitor sensor.
   • To install, tighten to 48 N.m {4.9 kgf.m, 35 ft.lbf}.
   NOTE: If necessary, lubricate the HO2S and catalyst monitor sensor with penetrating and lock lubricant to aid in removal.
5. To install, reverse the removal procedure.
   NOTE: Apply a light coat of anti-seize lubricant to the threads of the HO2S and the catalyst monitor sensor.