Constant beeping ~after~ oil change

[Paisley777]

***UPDATE***
While the oil pan was draining I was cleaning up in the car.
Went to Oreily and the codes are B1650 & B1826 - Occupant classification system malfunction & Open in side squib (right) circuit

So... new question... How do I shut this thing UP?
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Hello,

New one for me.

Car needed an oil change so it went through the normal flashes at start, then to solid maintenance light - but otherwise all good.

(not my first oil change with this car btw)

changed the oil.
Now when it beeps endlessly! No leaks from pan nut or filter. Oil levels look good. (always harder to see right after with that clean oil)

Notes:
spilled a bit when pouring in the new. Cleaned up and used some break cleaner on the belt to stop the squeaking.


Why is it doing this?

Thanks