Bugger, the report i have is around the pretty quite early British isles aw11 ecus which didnt manage to operate a cat over in the united kingdom, so no added data about exactly what the O2 sensor does right here. I used to be gonna return the engine, but at https://toyota4age81481.theideasblog.com/27197719/the-basic-principles-of-toyota-4age-for-sale