Needs an inspection now!
no a burnt out headlight will not cause a check engine light but if you go to most of the part places they will check the check engine light for free
3 lite
No
There Could Be Somthing Wrong With the engine. You should take it to a repair shop or something.
That requires an engine scanner to do that. Advance auto parts will scan it for free.
No.
Try disconnecting the battery for about 10 minutes
Faulty catalytic converter, or sensors in exhaust faulty
disconnect the battery for 10 mins
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With a scan too or with a battery disconnect.
replace the o2 sensors should do it.