2011 Prius misfire cold under load codes

Have you checked throttle body for oil, PVC valve, EGR circuit?

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In the first few seconds, the engine did not start and run fine. It was just being spun by MG1. Once it started, then the stumble began. If no coolant loss, then it's probably one or more ignition coils.

Wow! Way to pad your statistics. Much faster and easier to make all those comments at once like I'm doing.

 

Sometimes in the past I would make separate posts if I had separate things to say, and that way if one of those things became relevant in some later thread I would be able to link back to that specific post.

But then there was a time a mod went through and merged a bunch of my separate posts into one, breaking the links back to the individual posts. So now I try to play along and just keep editing my last post if there's no later one from anybody else, even when that means glomming topics together so they are harder to link to later.

 

I remember that turbulent time. Not sure which mod that was, but it got a little comical/tense lol.

 

That sounds familiar to me too. One can get carried away in either direction.

 

The beginnings of a head gasket leak might not show coolant loss yet

 

That is possible. But I'd still check those coils for two reasons. First is that it's so easy and second is that the symptoms fit coils better than head gasket from what I see in the description.

 

How many miles do you have on the car?

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The idea of checking the "resistance" of Prius "coils" came up not long ago, over here.



Because a Prius "coil" is in fact a whole transistorized igniter circuit, there just aren't a lot of reliable conclusions you can draw from a "resistance" measurement of it. The manual has you test them by shuffling them around, taking them out and watching the spark on a spark tester, or replacing with known good ones.