Those he tested as signal wires are in fact heater wires that should be small amount between 3-12 ohms. Other two blue /gray wired are single wires that need to test voltage in car with engine running or removed from car and need external heater to test it's functionality. With ohm test you will just get indefinite homes.
I check both bank 1 sensor 1 and bank 2 sensor 1 and only the bank 2 sensor 1 is not getting any reading on the multimeter. Bank 1 sensor 1 is getting multimeter reading. So most likely it will be a bad o2 sensor on bank 2 sensor 1 right? That sensor is also called air fuel ratio sensor right? They look the same as o2 sensor but they work diffrently?
My harness wires are all different colors.. ( blk,brwn, green,red) they don't match the new o2 sensors which has the 2 black wires.. how do I connect or test ..?
When heated oxygen sensors fail, it is NOT when its cold. The ceramic element changes resistsnce ad it heats up. Old sensors heater element becomes weak with age, does not change linerally with the others. Heated O2 sensor monitor ready test will be imcomplete, or fail. Unplug the O2 sensor from chassis, clips leads from multimeter to heater wire pins, start car and warm up. Take note of what it measured cold, and what it meadures when vehicle is warmed up. Do this for all O2 sensors. If anys value is 5% more ir kess than others, it will fail the monitor test.
