Just OBD'ed my Prius and got 4 errors...

First one you can ignore. Just search for the code.

Second one, P0420, Cat converter? How many miles on it?

 

If you are in an emissions state you are going to have to replace your converter to get your light to go off for the 0420 code other than that the solar sensor doesn't have nothing to do with anything Just forget about it put a flashlight over it and it won't it won't come back but you know you can't leave a flashlight sitting over the Sun sensor. But that's all that is that has nothing to do with anything The PO420 you're going to need to converter You can also try a spacer but not a spark plug anti Fowler a solid steel stainless probably spacer with a little piece of catalytic material in the middle of it that may work but your state that has emissions may kick you out because of that spacer so you have to know what you're doing where you are

 

B1421 just means the car was in the shade. It is literally what it says. "Solar sensor" == "is the car in the sun".

 

A bright flashlight pointed at the sensor will replace sunlight.))
Just like a shadow will block sunlight during the day so that the error value appears B1421.