Bugger, the short article i have is around the pretty pretty early UK aw11 ecus which didnt manage to run a cat more than in britain, so no further information about just what the O2 sensor does listed here. Icing to the cake, is that they ended up in a https://toyota4ageblacktopenginef38157.yomoblog.com/32894806/toyota-4a-ge-no-further-a-mystery