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Dominic Whelan (not verified)    April 1, 2021 - 3:57PM

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Thanks for the great info on the P0401 code. I am getting code P0301 on my 2010 Prius with 213,000 miles. It knocks loudly when it starts. I pulled the egr valve and tube and cleaned it thoroughly but didn’t check the motor and spring. I think that could be my issue as well. I constantly get a misfire in cylinder one fault. Thanks again for the troubleshooting advice.

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