You have some incorrect info for your test

The 02 sensor is as follows

White wires - heater coil.
Gray- neg 02 sig.
Blk- pos 02 sig.

The 3 test for heater are Resistance, short to ground, and current draw.
All these test are with connector unplugged.

test 1:
Ohms across white wires.. this is heater coil R test.
test 2:
Ohms across either white and gray. This is a heater short to ground test. There should be NO reading.
Test 3:
Bring 12v from battery to the white wires with an amp meter in series ..this is a heater current draw test. Looking for specs I mentioned in early post.

If all these test are OK, the heater circuit in the O2 sens. is OK
If any fail , replace the sensor.
These test only verify heater part of sensor and passing of these does not test the 02 sensors capacity to generate a sig to respond to rich/lean conditions, That is a different circuit of the sensor and a completely different test, using the gray/blk wire circuit... [ which I can post if you get the first test verified]

It is more than likely that your Indy has done these test, but I mention them only as insurance and for et al info...