Low oil pressure messages . my ford truck lariat 2005 motor turns off in safe mode and low oil pressure message pops up

There a problem with the engine. Check engine oil level, before starting vehicle back up. Make sure you are on level ground. Could be a sensor

But, the best thing is find out the Check engine light code, so you or a shop can start diagnosing.

So being it doesn't clatter in electric mode, a safe assumption is the noise is with the gas motor.

Usually a clattering noise is valvetrain noise, like a lifter not pumping up.

Low oil will cause this.

3 quarts low would probably definitely cause this!

You need to find out why you lost 3 quarts in only 80 miles!

Could be the oil pressure sensor. It stops the engine if oil pressure is to low.

Suggest you find a garage/auto repair who will remove the oil pressure sending unit on the motor and insert a oil pressure gauge and read the pressure.
Sounds like you have either a bad sending unit or maybe a plugged up oil filter. You are changing your motor oil every several thousand miles, right?
Be blessed.

If you have low oil pressure your oil pump may be failing.

OKAY, FIRST THING THE OIL LITGH WILL COME ON WHEN IT CUTS OFF . WHEN YOU TURN THE KEY ON THE OIL LIGTH COMES ON W/MORE LITGHS UNTIL YOU CRANK IT . SECOND WHEN THEY CHANGED THE BATTERY THE COMPUTER HAS TO RELEARN THE ENGINE WOULD UNHOOK BATTERY NEGATIVE CABLE TO RESET IT ,THEN DRIVE IT FOR A COUPLE MILES NOT WHERE YOU HAVE TO STOP ALOT .

Your pickup should have thrown a stored code if it has shut down. Get the code extrracted, and see if it indicates a sensor along with something else. I would advise you to install an after market gauge which operates independantly fron the existing oil pressure circuit to verify that it is a low oil pressure condition the next time it happens.Could be a faulty sensor, but it needs to be verified first.

is the filter blocked?
http://www.fordf150.net/misc/2004f150review.php

Cheers rob

i presume you have checked the oil level... so it's likely you will have to have a new oil pump installed. how are you checking the pressure by the way. if it's by the gauge on the truck consider taking it to a shop to confirm you have no pressure

I have found that the main cable to the starter is either broken or corroded. Replace the end and it should be fine.