If you have the California emissions package you have 1 AFR sensor (wide band) upstream of your catalytic converter, and 1 narrow band sensor downstream so one of our single wide band combo packs would work.
If you have the federal emissions package then you have 1 O2 sensor (narrow band) upstream of your catalytic converter, so one of our single Narrow Band EFIE?s would work.
We recommend or new ?Quad Digital EFIE Basic? to work with any narrow band sensor configuration.