Oxygen Sensor Testing

O2 Sensor Connector:

Disconnect oxygen sensor electrical connector from wiring harness, and connect an ohmmeter across terminals 3 and 4 of the sensor connector (white wires). Resistance should be between 5 and 7 ohms.
Replace the sensor if the resistance is infinite (open heater circuit).

Note: For oxygen sensor functional testing, SEE Powertrain Management/Computers and Control Systems/Testing and Inspection/Procedures.