Durango 4WD V8-5.9L VIN Z (1998)
Oxygen Sensor: Testing and Inspection
To perform a complete test of the O2S sensors and their circuitry, refer to Powertrain Management/Computers and Controls/Testing and
Inspection/Procedures/Diagnostic Charts. To test the O2S sensors only, refer to the following:
Fig 33 Upstream Oxygen Sensor
The upstream O2S sensor is located on the exhaust pipe.
Fig 34 Downstream Oxygen Sensor
The downstream O2S sensor is located on the outlet end of the catalytic converter.
Each O2S heating element can be tested with an ohmmeter as follows:
Disconnect the O2S sensor connector. Connect the ohmmeter test leads across the white wire terminals of the sensor connector. Resistance should be
between 4.5 ± .5 ohms and 7 ohms. Replace the sensor if the ohmmeter displays an infinity (open) reading.
