2003 Mercedes-Benz ML320 Q&A

2003 Mercedes-Benz ML320 Question: My low gas indicator started flashing ?

Yes I am blonde and also have 3/4 tank of gas ! Then it went off and the check engine light is on. I DID put regular gas in the car could that be my problem ? Should I top it off ASAP With the premium gas? Please advise I just got the car a hate I have a problem already !! Thank you -
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