Originally Posted by ITR97
so wrapping it up in tin foil will make the o2 sensor not sence the presence of carbon monoxide and other exhuast gases?
It throws a Code 67 when there is not enough difference in readings between the primary and secondary O2 sensors. Wrapping it in tin foil provides a different reading, so does just pulling it into the cabin really..
neither method is 100% reliable though, but unless the light really annoys you I wouldn't worry about it anyways.