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Jeep 2001 Jeep Sahara, oil pressure gauge is pegging at 80 psi. Bought new oil pressure sending unit, but can't locate it on the engine

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Down beside oil filter

Posted on Sep 15, 2010

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Oil pressure gauge pegs at 80 PSI as soon as you turn the key on. I have replaced the gauge and confirmed the sending unit is working properly. Any ideas on where to look next?


Sounds like a grounded wire. Most senders change resistance to the ground circuit of the gauge. If it pegs there is no resistance to ground and probably a shorted wire.

Dec 31, 2013 | 2003 Chevrolet Silverado 1500

1 Answer

2003 yukon denali oil pressure switch pegged over the 80 psi indicator. Oil qty is good.


Sounds like a bad oil pressure sending unit.

Try unplugging it and see if the gauge drops to zero. If it does than replacing the oil pressure sending unit will most likely fix your problem.

It is not easy to see or get at but you can find it on the back side of the engine on the drivers side, kind of in between the valve cover and the intake plenum

Apr 08, 2013 | 2003 GMC Yukon Denali

1 Answer

The oil pressure guage on my 2000 Jeep Grand Cherokee is registering 0. My oil was just changed and I don't see any indication of oil leaking anywhere. Could it be the sensor?


First off I wouldnt drive your car until you make sure that you have indeed oil pressure and that the gauge is a false reading, driving your car if in fact it has no oil pressure will severly damage your engine, but firstly i would check the oil pressure switch its located on the passenger side of the engine right back from the oil filter make sure the connector is clean and free from oil and corrosion if the connector appears to be in good shape take a paper clip and insert it between the 2 terminals inside the connector your oil pressure gauge should peak at 80 PSI that tells you that your gauge and all related wiring are good and in working condition, secondly remove the oil pressure switch and hook an manual oil pressure gauge up to you engine and start the engine the guage should have a oil pressure reading anywhere from 30 PSI to 55PSI depending on engine temperature if theres oil pressure on your manual gauge replace the oil pressure switch with a new unit, if you still have 0 PSI on your gauge then stop your engine immediatly and start looking at your oil pump and lubricating system for a problem.

Dec 06, 2010 | 2001 Jeep Grand Cherokee

1 Answer

Oil pressure gauge is reading 80 psi. I had the


The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.

Jul 20, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

Oil pressure gauge not reading on my 1994 jeep wrangler. oil is full just the guage has no pressure and not alot of power


The oil pressure specification for your engine is 13 PSI at idle hot, 37 to 75 PSI at engine RPM higher than 1600. I suspect your oil pressure gauge sender unit or gauge is inaccurate. I would have a known accurate mechanical oil pressure gauge temporarily screwed into the present oil sender unit to verify actual pressure.

If you have the correct pressure I would replace the sending unit first.

Sep 23, 2009 | 1994 Jeep Wrangler

1 Answer

Oil pressure gauge reads 80 psi with engine off and pegs running


That is probably a defective oil pressure gauge or a broken oil pressure sender, it reads 80 psi just because that is the maximum value allowed.

Pressure can be verified by reading it with a gauge tool.
If you really have pressure over 70 psi when engine is running then start replacing the oil filter, and check that the oil lines from pump are not obstructed, if there is nothing in there then replace oil pump.

If instead the gauge reads 80 with engine off, that is a defective pressure gauge.

Feb 25, 2009 | 2003 GMC Sierra 1500

1 Answer

My oil pressure switch pegs at 80


that sounds gd far as oil pressure does it have the lt1 motor

Nov 23, 2008 | 2002 Chevrolet Corvette

2 Answers

Oil pressure gauge reads 80(pegged),,oil tepm is 207....car runs great


it is probably the oil sending unit if you have access to a direct reading oil pressure gauge put it on and if oil pressure is reading normal replace sender

Nov 05, 2008 | 2000 Chevrolet Corvette

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