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It appears that all that you can test is the resistance across the sensor. Testing across terminals +b and HT at 20 degrees centigrade (68 degrees Fahrenheit) the front sensor (Bank 1 sensor 1) should give a a reading of 5~7 ohms, the rear sensor (bank 1 sensor 2) should return a reading of 11~16 ohms. Readings outside this range suggest replacing the sensor.
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See related link which includes instructions for testing any O2 sensor.
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