Check your oil level first (you didn't notice big oily spots under your car where it has been parked). Make sure the level is correct - your trust in lube places is misguided - always check yourself (trust but verify).

If oil level is correct - are you using the correct weight and type of oil and filter (look it up again in the owners manual). Fix as necessary.

Here is a good read - apparently not an unknown problem - http://www.taurusclub.com/forum/82-maint...

If your oil level is correct, the only other possibility is old oil or oil that is too thin. Use a heavier grade oil ; if using 5W30 go up to 10W30 or 10W40.

either it is low on oil or the oil pump is going out

besides the great suggestions, may I pass on another possibility?

Check the sensor relay switch and/or the connections between.

I'm driving ford Taurus SES 2002. it will ONLY happen after driving for about 10 to 15 minutes. once the engine is in idle ( below 1000 RPM ) it will start flickering and sometime just stay on until I push the Gas pedal.

It started right after I changed my oil for the first time after bought the car (Jan 2014). so I changed the oil couple of months ago and about 1 week later it started acting like this. I brought the car to the same mechanic and they told me it's because of the oil pump (after investigation). I called different mechanics and they say different things, like they said it might be because of bad oil filter that they installed (NOT craft). so I took the car to the lube stop and after checking the oil filter they said it was so loose and I had lost half of my oil. they fixed it and had it tight , pure some oil to the engine. I thought if the problem has been solved but after driving for about 10 minutes the problem came back. I changed the oil pressure censor with my friends car and I still have the problem !

please someone help me figure this out.

thanks