O2 Pigtail Was Cut Off, Bought A New One, Was Universal All Black Wires Dont Know Which Wires Connect To Which. Pigtail Was All Black Wires But The O2 Sensor Wires Were 2 White 1 Grey And 1 Black. The pigtail That Came From The Car were White W A Black Stripe, Red W A Yellow stripe, Red W A Green Stripe And Grey W A Red Stipe.