That's what's going to cause the error if you get it wet while crossing water, hence me buying a new filter housing (which included the sensor) for $250!
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Yeah, that's what I did also. From memory the new sensor alone was ~$180, or $250 for the complete new assembly including a genuine LR filter. It was a no-brainer to swap the whole thing.
Annoying when it doesn't rate a mention in the pre-sales inspection I paid for, *or* the subsequent service where I had them change the filter. You'd have thought a "hey mate, you know the water-in-fuel sensor is missing?" might have been useful.