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Codes p1688, p1691 & p1693 came up on trouble shooting computer, what seems to be the problem?

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I have a 1999 2500 dodge ram 5.9 turbo diesel. Codes p1688, p1691 and p1693 came up on trouble shooting computer. What seems to be the problem?

Vehicle: 1999, 2500 dodge ram, 5.9 diesel

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