Bugger, the report i have is around the really very early UK aw11 ecus which didnt appear to operate a cat over in the UK, so no additional details about what the O2 sensor does listed here. The 5 valve head is Toyota's reward on the 4AG once the 4AGZE https://4age20vitb16790.blogs-service.com/57697894/the-best-side-of-blacktop-4age