Low oil pressure

MARIOP452

MEMBER
2004 LINCOLN NAVIGATOR
5.4L
V8
4WD
AUTOMATIC
153,000 MILES

I was driving in Chico, CA when the "low oil pressure: comes on and then it goes into safety mode and shuts off. There is no rattling. The vehicle turned on right away and sounds smooth. What do you guys think is going on? And if you think it is the pressure sensor where do I find said sensor?

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,355 POSTS

Hi and thanks for using 2CarPros. Com.

If the oil is clean and full and there is no noise coming from the engine (knocking or ticking) my first suspect is the oil pressure switch. Often times, the crimp which holds the switch together will loosen, cause a leak, and then the pressure drops because oil is bypassing the switch via the leak.

Here are the directions. The switch is near the oil filter. All attached pictures correlate with these directions.

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Oil Pressure Sender

Removal and Installation
1. Raise and support the vehicle.

2. Disconnect the oil pressure sender electrical connector.

3. Remove the oil pressure sender.

4. NOTE: If reusing the sender, clean the threads and coat the oil pressure sensor threads with pipe sealant.

To install, reverse the removal procedure.

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Let me know if this helps.

Take care,
Joe

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