Oxygen Sensor Or Sub-Oxygen Sensor Heater

Disconnect electrical connector from the sensor. Using an ohmmeter, measure resistance between sensor terminals +B and HT. See Fig 1.
Replace sensor if resistance is not within specification. See OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS table.

OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS ⁽¹⁾

Application

Ohms

Pickup

2.4L

5.1-6.3 @ 68°F (20°C)

3.0L

2WD Except Cab & Chassis

4.4-5.4 @ 73°F (23°C)

2WD Cab & Chassis & 4WD

5.1-6.3 @ 68°F (20°C)

All Others

5.1-6.3 @ 68°F (20°C)

⁽¹⁾	Sensor testing temperature not listed by manufacturer.

Fig 1: Testing Oxygen Sensor Heater Or Sub-Oxygen Sensor Heater