Randall,

I wouldn't worry much. Mine has done this a couple of times, but only if it was more than a quart low and driving on the back-country roads. Check your oil level, I believe you may just be a little low. Also, how long has it been since you changed the oil? Have you changed brands or weight? These may be a shot in the dark, but I always check the obvious before replacing sensors or tearing down the oil pump .

Let us know what you find...