Question about 2004 Toyota Sequoia

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The oil gauge in my 2004 toyota sequoia reads sporadically, anywhere from no oil pressure to high oil pressure. I'm guessing it's the oil pressure sending unit. Where is it located on a 2004 sequoia?

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

Posted on Jan 07, 2009

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replace the oil pressure sender unit ( not the pressure sensor unit) as it appears to be faulty and stuck giving the wrong reading.

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What causes high oil pressure reading 1990 toyota pickup?


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1 Answer

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

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?


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1 Answer

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if it is electrical oil pressure sensor I would start there. The best way to see if you have a major problem is to use a mechanical oil pressure tester. Take off the oil pressure sensor and put the mechanical tester on. The tester should come with a Gage. If it comes within your trucks oil pressure range than all is fine and replace the sending unit and see if that don't help your problem.If the tester runs high then the oil pump is bad or your cam-bearings could be the problem. But with cam-bearings you would usually get a low reading.

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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.

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