My '01 has a "knock" over washboard sections which sounds as if something is loose. I had the dealership check it out and they could find no flaw. There was some talk on one of the other boards, Edmunds or Yahoo, which about an improper weld somewhere in the strut towers, but I have not explored that possibility, yet.
Jerry O.
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2001 Odyssey GG LX
Jerry O.
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2001 Odyssey GG LX