Bugger, the posting i have is to the extremely extremely early United kingdom aw11 ecus which didnt appear to operate a cat in excess of in the united kingdom, so no extra information about exactly what the O2 sensor does below. Sensors and Vacuum Lines: Following deciding about the configuration https://waylonoooli.bloggadores.com/26512296/considerations-to-know-about-4age-20v-itbs