Check engine light doesn't come on

The wire are good and the bulb is good, outside of the green orange wire what other wire does for the malfunction indicator light, it gotta be 2 wires bc with the light on the bottom is ~.9 volts and the top is at ~12 volts

And while im at does anyone know what transistor or capacitor it could be, ik it sounds like the opposite of a problem but I like to know when my car got a problem