Question about 2004 Nissan XTerra

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My 04 XTerra's oil light keeps coming on but there is oil in the car....not overheating, driving okay??? I am perplexed.

Posted by Anonymous on

  • texastbone
    texastbone Mar 12, 2011

    is it a low oil light or a oil pressure light?

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Nissan x terra 4.0 engine loses oil pressure
if it loses oil pressure it is generally the oil passage port gaskets located under the main timing cover on the internal timing cover.The parts are not made by nissan so youll have to make your own gaskets or buy a new cover which are not cheap.The passage ports go from the heads down to the oil pump and there is another shorter one located just below it.They are made out of steel instead of aluminum like the timing cover...cooling and heating at different rates may be part of the problem. While your inside the motor, also check the silicon under your hydraulic chain tensioners and tensioner plastic runners or guides as well..they make a supercharger sound when they are worn out...whining noise...good luck

Posted on Mar 21, 2011

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There are a couple of things that could cause this issue. The first of which, and considering that this is a Nissan which builds a remarkable vehicle and engine, it is probably the oil sending unit. These can go out from time to time. The oil sending unit lets you know when the oil pressure is lower than it should be for safe operation, thus causing the light to illuminate. If the sending unit is bad, then it will not correctly gauge the oil pressure, and will trigger the light. Changing this can be an easy job if you have the correct tools. You can get the sending unit at any auto parts store, or your local Nissan dealer. If it is not the sending unit, you may be either looking at a dirty oil filter, bad,or low oil, or a weak oil pump. My bet is on the sending unit. Good luck.

Posted on Mar 12, 2011

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1st you need to do an oil pressure test. If it reads between 20psi-60psi, then it's Ok and you have a bad oil pressure switch. If it's below the above specs then you have an internal engine problem - IE: bad oil pump, bad bearing, etc...

Posted on Mar 12, 2011

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