Toyota Avalon (XX50): Heated Oxygen Sensor

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / 2gr-fks Engine Control / Heated Oxygen Sensor

Components

COMPONENTS

ILLUSTRATION

*1	FRONT FLOOR COVER LH	*2	FRONT FLOOR COVER RH
	Nm (kgfcm, ft.*lbf): Specified torque	-	-

ILLUSTRATION

*A	Type A	*B	Type B
*1	BODY MOUNTING PLATE	*2	NO. 1 ENGINE UNDER COVER
*3	REAR ENGINE UNDER COVER RH	*4	FRONT WHEEL OPENING EXTENSION PAD LH
*5	FRONT WHEEL OPENING EXTENSION PAD RH	-	-
	Nm (kgfcm, ft.*lbf): Specified torque	-	-

ILLUSTRATION

*1	FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst)	*2	NO. 1 EXHAUST PIPE SUPPORT BRACKET (for Lower Side)
*3	HEATED OXYGEN SENSOR (for Bank 2)	*4	HEATED OXYGEN SENSOR (for Bank 1)
*5	GASKET	-	-
	Nm (kgfcm, ft.*lbf): Specified torque	*	For use with SST
●	Non-reusable part	-	-

Inspection

INSPECTION

PROCEDURE

1. INSPECT HEATED OXYGEN SENSOR (for Bank 1)

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

Standard Resistance:

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

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

*a	Component without harness connected (Heated Oxygen Sensor)

2. INSPECT HEATED OXYGEN SENSOR (for Bank 2)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (HT2B) - 2 (+B)	20°C (68°F)	5 to 10 Ω
1 (HT2B) - 4 (E2)	Always	10 kΩ or higher

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

*a	Component without harness connected (Heated Oxygen Sensor)

Installation

INSTALLATION

PROCEDURE

1. INSTALL HEATED OXYGEN SENSOR (for Bank 2)

HINT:

Perform "Inspection After Repair" after replacing the heated oxygen sensor.

Click here

(a) Using SST, install the heated oxygen sensor to the front exhaust pipe assembly (TWC: Rear Catalyst).

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.

HINT:

Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.
Click here
When using SST (fulcrum length of 30 mm (1.18 in.)) + torque wrench (fulcrum length of 180 mm (7.09 in.)):
37.7 N*m (384 kgf*cm, 28 ft.*lbf)

*a	Torque Wrench Fulcrum Length

2. INSTALL FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst)

Click here

3. INSTALL NO. 1 EXHAUST PIPE SUPPORT BRACKET (for Lower Side)

Click here

4. INSTALL BODY MOUNTING PLATE

Click here

5. INSTALL FRONT FLOOR COVER LH

Click here

6. INSTALL FRONT FLOOR COVER RH

Click here

7. INSTALL HEATED OXYGEN SENSOR (for Bank 1)

HINT:

Perform "Inspection After Repair" after replacing the heated oxygen sensor.

Click here

(a) Using SST, install the heated oxygen sensor to the front exhaust pipe assembly (TWC: Rear Catalyst).

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.

HINT:

Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.
Click here
When using SST (fulcrum length of 30 mm (1.18 in.)) + torque wrench (fulcrum length of 180 mm (7.09 in.)):
37.7 N*m (384 kgf*cm, 28 ft.*lbf)

*a	Torque Wrench Fulcrum Length

(b) Engage the wire harness clamp.

8. INSPECT FOR EXHAUST GAS LEAK

Click here

9. INSTALL REAR ENGINE UNDER COVER RH

Click here

10. INSTALL NO. 1 ENGINE UNDER COVER

Click here

11. INSTALL FRONT WHEEL OPENING EXTENSION PAD LH

Click here

12. INSTALL FRONT WHEEL OPENING EXTENSION PAD RH

Click here

13. PERFORM INITIALIZATION

(a) Perform "Inspection After Repair" after replacing the heated oxygen sensor.

Click here

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
Replacement of heated oxygen sensor Gas leak from exhaust system is repaired	Inspection after repair	Poor idle, etc. Engine start function, etc.

PROCEDURE

1. REMOVE FRONT WHEEL OPENING EXTENSION PAD LH

Click here

2. REMOVE FRONT WHEEL OPENING EXTENSION PAD RH

Click here

3. REMOVE NO. 1 ENGINE UNDER COVER

Click here

4. REMOVE REAR ENGINE UNDER COVER RH

Click here

5. REMOVE HEATED OXYGEN SENSOR (for Bank 1)

(a) Disconnect the heated oxygen sensor connector.

(b) Disengage the wire harness clamp.

SST: 09224-00012

NOTICE:

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

6. REMOVE FRONT FLOOR COVER LH

Click here

7. REMOVE FRONT FLOOR COVER RH

Click here

8. REMOVE BODY MOUNTING PLATE

Click here

9. REMOVE NO. 1 EXHAUST PIPE SUPPORT BRACKET (for Lower Side)

Click here

10. REMOVE FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst)

Click here

11. REMOVE HEATED OXYGEN SENSOR (for Bank 2)

(a) Using SST, remove the heated oxygen sensor from the front exhaust pipe assembly (TWC: Rear Catalyst).

SST: 09224-00012

NOTICE:

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

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