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Thanks everyone here for all the insightful posts and threads. I successfully got rid of the dreaded knock by removing and cleaning of the EGR...
2010 Prius. This all started with error codes P0300, P0302, P0304, P0401. The dealer wanted around $1000 to replace the EGR Valve, which didn’t...
I have a 2012 gen 3 with 271,000 miles and the check engine light came on. I watched all the videos and have read all the posts about P0401 code...