Bugger, the posting i have is to the really very early United kingdom aw11 ecus which didnt manage to operate a cat around in the UK, so no added data about exactly what the O2 sensor does right here. I place bars on best and bottom to assist the manifold https://connerwzxti.shotblogs.com/detailed-notes-on-4age-20v-blacktop-for-sale-40682367