This sensor is supposed to be an exact match. I had an O2-A2 and this one is supposedly the same sensor. Unfortunately, I didn't try it right away and it is either not actually an O2A2 or it isn't new. Regardless, the return window is closed and I am out $100.After contacting the seller they gave me a refund for the sensor. I still think they have issues with their supplier as these sensors just work if they are genuine. I will leave it to them to sort things out.