Toyota Prius: Heated Oxygen Sensor

Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during heated oxygen sensor removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Gas leak from exhaust system is repaired	Inspection after repair	Poor idle, etc. Engine start function, etc.

CAUTION:

To prevent burns, do not touch the engine, exhaust pipe or other high temperature components while the engine is hot.

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	WIRING HARNESS CLAMP BRACKET	82715W	-	-	-
2	HEATED OXYGEN SENSOR	89465		-	-

PROCEDURE

1. REMOVE WIRING HARNESS CLAMP BRACKET

2. REMOVE HEATED OXYGEN SENSOR

(1) Disconnect the heated oxygen sensor connector.

(2) Disengage the 2 wire harness clamps.

(3) Using SST, remove the heated oxygen sensor from the front exhaust pipe assembly.

SST: 09224-00012

NOTICE:

If the heated oxygen sensor has been struck or dropped, replace it.

Inspection

INSPECTION

PROCEDURE

1. INSPECT HEATED OXYGEN SENSOR

*a	Component without harness connected (Heated Oxygen Sensor)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
1 (HT1B) - 2 ( B)	20°C (68°F)	5 to 10 Ω	Ω
1 (HT1B) - 4 (E2)	Always	10 kΩ or higher	kΩ

If the result is not as specified, replace the heated oxygen sensor.

Installation

INSTALLATION

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	HEATED OXYGEN SENSOR	89465		-	-
2	WIRING HARNESS CLAMP BRACKET	82715W		-	-
3	INSPECT FOR EXHAUST GAS LEAK	-	-	-

N*m (kgf*cm, ft.*lbf): Specified torque

*

For use with SST

PROCEDURE

1. INSTALL HEATED OXYGEN SENSOR

*a	Torque Wrench Fulcrum Length	*b	Tube
*c	Wire Harness Clamp	-	-

(1) Using SST, install the heated oxygen sensor to the front exhaust pipe assembly.

SST: 09224-00012

Torque:

Specified tightening torque :

44 N·m {449 kgf·cm, 32 ft·lbf}

NOTICE:

If the heated oxygen sensor has been struck or dropped, replace it.

(2) Engage the 2 wire harness clamps so that the tube is positioned as shown in the illustration.

(3) Connect the heated oxygen sensor connector.

2. INSTALL WIRING HARNESS CLAMP BRACKET

*a	Correct	*b	Incorrect
*c	Standard Position	-	-

(1) Install the wiring harness clamp bracket to the heated oxygen sensor.

NOTICE:

Align the edge of the wiring harness clamp bracket and heated oxygen sensor as shown in the illustration.

3. INSPECT FOR EXHAUST GAS LEAK

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