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Turns out disconnecting and reconnecting the 12V battery made it so it would enter ready mode. So it seems like it was indeed the cottonwood fluff...
To be clear, it now goes to IG-ON setting with no red triangle, but all other warning lights are on. But my memory is that it was it is suppose to...
An update. I realized there was a NAPA store just a few blocks away and they were willing to come read the error codes. It is throwing a P3190....
I was driving my 2007 Prius today and the red triangle came on and it lost acceleration. I coasted to a side street. If I turn the car on it will...