Air Fuel Ratio Sensor: Inspection: Inspection

INSPECT AIR FUEL RATIO SENSOR (for Bank 1)

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

Fig 1: Identifying +B, HA1A & A1A- Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

Tester Connection	Condition	Specified Condition
1 (HA1A) - 2 (+B)	20°C (68°F)	1.8 to 3.4 Ω
1 (HA1A) - 4 (A1A-)	Always	10 kΩ or higher

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

INSPECT AIR FUEL RATIO SENSOR (for Bank 2)

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

Fig 2: Identifying +B, HA2A & A2A- Connector

Standard Resistance

Tester Connection	Condition	Specified Condition
1 (HA2A) - 2 (+B)	20°C (68°F)	1.8 to 3.4 Ω
1 (HA2A) - 4 (A2A-)	Always	10 kΩ or higher

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