spoolin_teg

My stock o2 sensor needed to be replaced, so I went to auto zone to get a new one, and saw the OEM replacement o2 sensor was way too much, and I wasnt about to pay that, so I got a universal Denso o2, the ones you gotta wire yourself. The thing is, on the o2 sensor its got 4 wires, 1 white, 1 blue, 2 black. On the connector for the car its got 1 green, 1 white, and 2 black. Since there's 2 black on each, the o2 and the connector would it matter which black went to eachother black? Is there a chance I got a wrong o2 sensor or that the green and blue are supposed to be connected? I believe my o2 is the reason my car wont idle right until its about warm. Any help would be appreciated guys.