Bugger, the short article i have is to the quite really early UK aw11 ecus which didnt appear to operate a cat in excess of in the united kingdom, so no further details about what the O2 sensor does in this article. Steer clear of the 7AF to 7AG conversion https://4age-20v-turbo-engine-for48135.link4blogs.com/48894076/4age-20v-itbs-fundamentals-explained