Same issue here on my '05 ProV. 1st 2 times it was a water sensor, took 2 different times (being constantly beeped at) replacing the part to work right. From what I was told, there were a bad run of sensors from Merc. Just last season, ours did the same as yours is doing. That time (and it did go into limp mode), it was the oil pressure sensor. Once that was replaced, and the computer was reset (they forgot to reset after fixing, and it did the same thing again, on the water---argh) everything worked fine.
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