Oxygen Sensor

[twing]

I dnt evn think i hv a o2 sensor on my headers. though no error check lights come on? ... wtf?

You have B16? you should have them. Go under the car and check. One before the cat and one on/after the cat. The first one is on head collector pipe.

D16 has the first sensor on primary pipe, which is clearly visible on engine bay.