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I've got a 2003 Toyota Sequoia limited. I noticed that the oil pressure gauge will drop to low for a short time at highway speeds then go back to normal. What could that be?

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  • Toyota Master
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Sensor is going bad replace it

Posted on Apr 28, 2015

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Posted on Jan 02, 2017

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ginko
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SOURCE: fluctuation on the oil pressure gauge reading

The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.

The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.

If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.

If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.

Posted on Nov 24, 2008

dgjtex
  • 405 Answers

SOURCE: The oil gauge in my

have you changed the oil sending unit, this is the most probable cause.

Posted on Jan 07, 2009

mecanica03
  • 907 Answers

SOURCE: low oil pressure 2002 toyota sequoia

maybe your engine need an oil service, or better oil quality , try to use an 10w-40 engine oil

Posted on Apr 21, 2009

Molson02536
  • 3854 Answers

SOURCE: oil pressure problem

You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil. 
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it. 
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector. 
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL

Posted on May 29, 2009

  • 1861 Answers

SOURCE: 2003 sequoia,The oil pressure gauge reads low and

There is no Special Service Campaign on that issue. There is, however, a TSB on that issue, and the fix is to replace the sending unit and the gauge.

Posted on Nov 09, 2009

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Sounds like your oil pump may have seized.You'll need a gauge to verify this. The engine has a mechanism by which it automatically cut the engine off if there's a sudden drop in pressure. I would replace the pump. If you do make sure you prime it prior to tightening the oil pan down. A big question is why you were that low on oil. Good luck!

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You'll want to remove the electrical oil pressure gauge and check the oil pressure with a manual gauge to verify low oil pressure. If the oil pressure tests good with a manual gauge, then you either have a faulty oil pressure sender, or gauge in the dash (I rarely see faulty gauges). If the pressure is still low, suspect worn crankshaft bearings. There is also a possiblity that the screen to the oil pump is clogged. This can be visually checked by removing the oil pan and cleaned.

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1995 Ford Econoline 150 with 302 engine. Oil pressure indicator starting dropping when idle speed went down, Had a new oil pump and sending unit replaced, still does the same thing. Has 190K on it, now as...


When you had the pump replaced did anyone look at the rod and main bearings? 99% of all low oil pressure problems I've seen has been directly related to bearing wear, not a bad oil pump.
Replacing the pump will give you slightly better pressure temporarily but that won't last very long.
Verify the actual oil pressure using an external mechanical gauge. If it's low (likely it is) go back into the oil pan and use plasti-gage on the bearings to measure clearances.
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First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

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I have a 2003 Sequoia and the oil pressure is very low at start up. It does not climb to a qrtr of gauge for 4-5 minutes and never seems to get to half. Oil amount is not the issue - is there a known...


have an oil pressure test performed - should only cost around a half hour of diagnostic labor. this will tell you if you have a real oil pressure problem, or a bad sensor.

Dec 30, 2009 | 2003 Toyota Sequoia

1 Answer

MY OIL GAUGE IS GOING ALMOST TO ZERO WHEN I'M IDLING BUT GOES UP TO 40 WHEN I'M MOVING AND WHEN I'M IN PARK.


You have a bad oil pressure sending unit. There is an updated unit available at your toyota dealer parts dept.

Nov 09, 2009 | 2003 Toyota Sequoia

1 Answer

2003 sequoia,The oil pressure gauge reads low and floats around. I had an earlier sequoia that the sending unit was replaced for the same problem. Is there a SSC on this problem?


There is no Special Service Campaign on that issue. There is, however, a TSB on that issue, and the fix is to replace the sending unit and the gauge.

Nov 09, 2009 | 2003 Toyota Sequoia

2 Answers

Fluctuation on the oil pressure gauge reading


The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.

The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.

If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.

If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.

Nov 24, 2008 | 2003 Toyota Sequoia

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