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I went to start my 2004 Prius, all the dash lights came on looking almost normal, then they all went out except the "Check" engine light. Most posts that I've read the car keeps running. I tightened the gas cap. Has anyone experience this condition?
 

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How old is your 12v battery? Low voltage on the 12v bus will cause that symptom.
Your post is a little unclear. Did the car actually go into READY, or did it not start?
 

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