Bugger, the write-up i have is within the very pretty early UK aw11 ecus which didnt manage to run a cat above in the UK, so no more data about what the O2 sensor does in this article. The 5 valve head is Toyota's reward to your 4AG following the https://elliottonlif.ivasdesign.com/48739016/top-guidelines-of-4age-engine-for-sale