Oxygen sensor where exactly is the oxygen sensor on a 2005 chevy equinox awd

They are all located on you exhaust system. Start from you exhaust manifold and follow the pipes down to the tail pipes . You will see the sensors (4) they are screwed into exhaust pipes and they have wire connections on them (Kinda Looks Like a spark Plug) they wires are unusually colored in white black and grey. Good Luck contact if you need more information