Gen 3 Prius rough cold start plus slow coolant loss

I wouldn't throw parts yet. If a shop can't duplicate it on the 2013 Toyota Prius, bring a video plus freeze-frame data, not just a story. That's the branch I'd chase this week. That's the whole play. I'll update if anything new shows up.

Intermittent stuff lies if you only catch it once. Capture voltage while the 2013 Toyota Prius is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. On “gen 3 prius rough cold start plus,” that was the fork that mattered for me. Learned this the expensive way on a previous car. Climate here is different, so treat that as a local data point. That's my plan before I call anyone.