Using a wideband O2 sensor

[raz]

The controller needed is complicated, not something you would design yourself in an afternoon. But there are DIY kits available, like Megasquirt and I think there are others too.

 

I use an Innovate LC-1.

[gstallons]

FWIW... all of these sensors have one thing in common. They generate a voltage signal anywhere from (usually) 150mv to 900mv.

The AFR sensor is probably the "fastest" of the sensors. This is best for more efficiant monitoring of the exhaust gases.