For simple emissions control, it is often a good choice to fit a simple Narrowband Lambda sensor. See how to wire them here. For information on tuning a narrowband lambda control system for emissions, see here.


A narrow band outputs 0-1 Volts depending on the AFR, being only accurate around its midpoint (0.5v) at an AFR of 14.7. It cannot be used for load tuning etc, only for light load closed loop feedback for emissions control.