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engine problems

  1. Code P3400 issues. 2006 300c w/5.7L Replaced MDS solenoids and code came back

    5.7 V8 Engines
    06 300c w 5.7L 114k miles. I had a knock sensor code on originally so I replaced the knock sensor and as per the tech spark plugs as they had never been replaced. I had a code come back now it's p3400 MDS solenoid fault bank 1. I had him replace the MDS solenoids as they were dirty and pretty...