Bugger, the article I've is over the quite really early UK aw11 ecus which didnt manage to run a cat more than in britain, so no more data about what the O2 sensor does here. That's what the resistor pack on some variations in the 4AGE does.Your MicroSquirt® EFI controller https://4age20vforsale37791.bloggosite.com/32974273/the-best-side-of-blacktop-4age