Bugger, the article I've is about the quite quite early United kingdom aw11 ecus which didnt appear to run a cat above in the united kingdom, so no further data about what the O2 sensor does below. Excellent car products and solutions and awesome customer support. My third purchase from https://4age20vitb36930.diowebhost.com/81805709/the-fact-about-toyota-4age-for-sale-that-no-one-is-suggesting