Sportage 2WD 4Dr L4-2.0L (2000)
Oxygen Sensor: Testing and Inspection
HEATED OXYGEN SENSORS
Inspection of Terminal Voltage for the Front & Rear Heated Oxygen Sensor
1. Warm up the engine to normal operating temperature.
2. Run engine at idle speed.
3. Connect a voltmeter between terminal 4 (BLK/RED wire) and ground.
4. Increase and decrease the engine speed quickly several times.
5. Verify that the meter reading varies between 0 - 1.0 V.
NOTE: Rear oxygen sensor voltage does not fluctuate as quickly as front oxygen sensor.
6. If not as specified, inspect:
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On-board diagnostic system
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System inspection
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Intake manifold vacuum
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Fuel line pressure
7. If all the Systems are normal, replace the heated oxygen sensor.
Inspection of the Front & Rear Heated Oxygen Sensor Heaters
1. Ensure the ignition switch is OFF.
2. Disconnect the heated oxygen sensor connector.
3. Connect an ohmmeter between terminals 2 and 4 and measure the resistance.
Specification: approx. 5 Ohms (68 °F {20 °C})
4. If not as specified, replace the heated oxygen sensor.
Tighten to 22 - 36 lb-ft (30 - 49 N.m).