Oil Pressure stuck at 80PSI

My pressure has been stuck at 80PSI for the last 2 days.
(99XJ, 4.0L)
My guess is I need to clean the connection or the pressure sensor is bad.
It does this with ignition on, engine off as well.

Any guesses before I take a look?
I hope the connector just needs a cleaning. I washed that area of the engine with simple green and a water hose about 2 months ago. Maybe that has something to do with it if some of it got into the connector pin area.

MAP

Sounds right to me.

My connector broke off and mine was pegged out. I just replaced the switch.

I would assume a bad switch because oil pressure is supposed to be relieved by the system at 75 psi.

Switch broken or wire disconnected. Post 90 switch defaults to high position when disconnected. Pre 91 goes low when disconnected, high when shorted.

Matthew Currie said:

Switch broken or wire disconnected. Post 90 switch defaults to high position when disconnected. Pre 91 goes low when disconnected, high when shorted.

Click to expand...

My 88 goes high when open and low when shorted.

Matthew's right - there's not a constant flow of electrons through the sender. If it's unplugged or if the connection is corroded you'll get the max reading on pressure.

A day later that I started it the pressure would show 50PSI.

Just turning the key to the run position, engine off, gives a 40-50PSI reading.

I disconnected the connector and the reading stays at 0PSI even at the run position.

Disconnected the connector and cleaned the connection and tried mating and demating several times with the same results.
The connection is just 2 wires so it appears there's just a strain gauge on a diaphragm.

Looks like my pressure sensor needs replacing.

I've seen prices from $29 up to $46!!! for a pressure sensor!!
I'll check the dealer for their price.

That's nuts.
Does anyone know of cheaper(more reasonable) source?

Thanks,
MAP

got mine from advance for $16.74. Part number: 5971608

looks just like the factory one and has a one year warranty, like it matters.



AH hell, just noticed you have a 99. probably not going to be the same part then. eh well perhaps someone else will benefit.