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2009Prius · 06-15-2010, 02:56 PM

Assuming this is abnormal as you described (entered S4 successfully but later apparently got out of S4 without the engine or the cat getting cool), I would start by checking the 12V battery and the MAF sensor. Good luck!

06-15-2010, 02:56 PM	#8 (permalink)
2009Prius EcoModding Lurker Join Date: Jun 2010 Location: USA Posts: 34 Thanks: 8 Thanked 2 Times in 2 Posts	Assuming this is abnormal as you described (entered S4 successfully but later apparently got out of S4 without the engine or the cat getting cool), I would start by checking the 12V battery and the MAF sensor. Good luck!