Chevron Techron concentrate should fix it. Have done it to many of my clients cars. Some have run over 6 months with no more errors.
Wow, fourteen words of description, and someone fixes the problem from miles away! Who needs mechanics these days?
Fixes? Clearly says should, not "will" fix the problem. I've done this to 4 prius with cyl misfires and the errors haven't come back. The highest with about 360k miles. Who needs mechanics that will con you? Most are as crooked as the dealer.