Ok so my pickup is throwing the code 21 which is the o2 sensor I've replaced it with one of the universal bosch ones wired black to black, grey to brown,and the two white wires to the pink and green and the red and white correct me if I'm wrong with the wiring there the cat is after the o2 sensor and was removed by the previous owner but never through the code before with the cat out like I said the code 21 is the only code and I reset everything and still is there it idles between 800 and 2000 rpm and has an occasional miss any help with this would be appriciated