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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.
the fuel pump should be running around 40 ohms
5 ohms
Find out the ohms range it must be within and do an ohms test.
5,672 Ohms at half-way open...good luck!
Bank 1 sensor 1 on a '02 Suzuki XL7 should be 5.0 - 6.4 ohms. Looking at the connection with the undo clip pointing down, do an ohms test between the two top prongs. These are the 2 heater wires for the O2 sensor. Depending on manufacturer they will most likely be either 2 white or 2 black wires.
Take it out and ohm it should be about 350 ohms if it doesnt ohm most likely bad.
They should read 5.5 ohm's
The only fix is to replace it. If you are mechanicly inclined, this is a doable deal. Before you replace the sensor you should check the wiring for resistance you can use a volt/ohms meter (vom) and test the continuity of the wiring to the sensor.
Using a Digital Multimeter set to 2k,..the resistance should be 200 to 900 ohms ifnot replace,
1000 ohms.
6000-8000 ohms