Quote Originally Posted by AnthonyF
^thats what a CEL is for. It still is a waste of money.
-Ant.
Actually, OBDII responds quicker to non reacting O2 sensors over a OBDI system. You can take it down the road and watch the thing not react and the light will stay off. Your fuel economy will suffer and all while the light never came on. If on an OBDII system an O2 sensor is just a bit on the slow side but still works, the light will come on. Very sensitive and I wish OBDI was like that. That's why I wouldn't consider it (the AFR gauges) being a waste of money. Especially if you have more than 1 O2 sensor like myself, which I have 2 and one of which isn't reacting. No CEL, btw. On an OBDII car, I wouldn't consider it on an OBDII car because you can hook up any scanner on the fly and you can watch it's performance.