Yes
Not likely. A bad O2 sensor would illuminate the check engine light and the engine performance would suffer.
Yes, an unplugged sensor can cause a check engine light.
It could
check crank sensor
The engine coolant temp sensor can do that. If you have a check engine light on, have the codes read.
check for tune-up, check maf sensor, check o2 sensors, do a fuel system service.
There is another cause for the code.
That is what the check engine light is for. It informs you of a failure.
No, it would not. There are many things that could cause a stall at idle. The throttle plate could be dirty as well as the mass air flow sensor. You did not mention the kind of car or engine size. Is the check engine light on, is it when the engine is warmed up or cold?
It is possible.It is possible.
Yes, it is one of many things that can cause the check engine light to come on.
Oxygen Sensor. Or the Knock Sensor. Or you could check the plugs for faults.