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P1900 - oss circuit intermittent malfunction. what does this mean..

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Engine light on. Code is p-1900. Oss circuit intermittent malfunction. Means what exactly

Vehicle: 1997 Nissan quest

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P 1900 Oss circuit intermittent, or the transmission is slipping, Inspect the transmission fluid, is it brownish or blackish, if it is a rebuild is the solution.

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