Testing - Ford Ranger Maintaince And Repair Manual

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Typical Heated Oxygen (HO2S) sensor mounting locations−Ranger shown, other models are

TESTING

Do not pierce the wires when testing this sensor; this can lead to wiring harness damage. Back probe the

connector to properly read the voltage of the HO2S.

Disconnect the HO2S.

Measure the resistance between PWR and GND terminals of the sensor. If the reading is

approximately 6 ohms at 68°F (1°C). the sensor's heater element is in good condition.

With the HO2S connected and engine running, measure the voltage with a Digital Volt−Ohmmeter

(DVOM) between terminals HO2Sand SIG RTN(GND) of the oxygen sensor connector. If the

voltage readings are swinging rapidly between 0.01−1.1 volts, the sensor is probably okay.

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