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Thank you for you the reply. The self testing info is fantastic.
I really appreciate the feedback. Thank you.
I had heard that it has to do with moisture/condensation in the manifold and not carbon. I am no expert , but that is how it was explained to me.
I bought my 2010 Prius (V) in 2017 with 60k miles on it. It now has 130k. I have a couple of questions: Are dirty/old EGR valves and...