Bugger, the write-up i have is over the quite quite early United kingdom aw11 ecus which didnt appear to operate a cat above in the united kingdom, so no added information about just what the O2 sensor does listed here. from another Discussion board wrote:It's possible I have skipped this, https://codynsxda.blogunteer.com/26383403/considerations-to-know-about-4age-20v-itbs