ya i think i'll stick with 2 sensors then. by any chance does anyone know what cylinder's the o2 sensors should be conected too? there is one with a white round plug and the other with a green not so round plug. like 2 plugs in this picture (
http://www.hybridgarage.com/tech/b16/2_7_15.jpg ). I just bought the car and it came with a header so i have a feeling that someone might not have payed attention to the location of the sensors and got them mixed up. thanks.