2 o2 sensors

would anyone know why a b16a would come with 2 o2 sensors on it?..i’m a little confused

i believe stricter emissions controls in japan.

OBD2 has two O2 sensors, right? Maybe it’s OBD2.

non-obd has 2 single-wire sensors on the b16’s. obd-i has one 4-wire sensor.

ok thanks, i was just curious…