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That is the check engine light.
A flashing check engine light is an indication of a misfire.
Check engine light, see related question below.
go to autozone to ask to check your codes
The only proper way is with a scan tool.
No, the oil change reminder and the check engine light are unrelated.
Transmission, maybe. Check engine light
It would be very rare for a P1684 code to turn the light on.
try disconnecting battery for 15 minutes
No. It should not.
It might be that your pcv valve is plugged or the egr valve is sticking.
you need a scanner.there's many cheap "[obd2] scanners out there. or you can go to autozone and they scan it for free.