Question about 1995 Nissan Altima

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Oil Pressure Light

My oil pressure light stays on for an extended time after car has set over-night. Oil light goes off quickly during normal driving. Problem only accures during first start-up of the day. I have changed Oil Pressure switch.

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  • Anonymous Nov 30, 2008

    my oil pressure light will not go off on my four-wheeler

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Chances are you do have low oil pressure, you should have a pressure check run with a mechanical test guage to verify the low oil pressure, for now assume the oil press is low, I wouldn't drive the car, you run the risk of damage to the engine bearings, a very very expensive thing to repair.

Posted on Oct 06, 2008

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My 2007 Buick 3.9 liter oil light comes on and off. ..stays on for a while then goes back out. Checked the oil level all good. I did recently change the oil to GTX 5w30 extended milage oil. Any idea


The oil light comes on when the oil pressure sensor detects low oil pressure. The amount of oil has little to with it, although very low oil levels can cause loss of oil pressure. The best thing to do is to have the engine's oil pressure checked with a mechanical oil pressure gauge to ensure that the oil pressure is sufficient at all operating speed and temperatures. If the oil light is still flashing on and off and there is no indication of low oil pressure by the gauge, then replacement of the oil pressure sensor is recommended.

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High temp low oil pressure light comes on after driving for a few minutes, then off when engine at driving rpm. At stop light (idle or low rpm) light comes back on. Normal driving it goes out.


You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.

The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.

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May need a new oil pressure switch,it's located next to oil filter,remove electrical connector then part.You may have to remove oil filter to remove part.

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1992 honda accord 245,000 miles oil light blinking while idling and once while I was driving the oil level is good. what could be the problem


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engine oil pressure may be low remove oil pressure sending unit and install a pressure gauge check for pressure while warm if pressure is ok replace oil pressure sending unit oil pressure at idle should be between 5-15 psi at min

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bout the oil pressure gauge its normal to go up but not to high coz u might overheat, try checking the cylinderhead gasket if there is pressure coming out, replace the gasket if needed

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I have a 2002 Maxima 6 Speed Manual Trans. Under Heavy Acceleration the check engine light blinks several times and then goes off and stays off during normal driving. The light seems to come on as I hit...


U have an ignition related problem, have the system tested for the trouble code that is stored in memory any time the check engine light comes on to determine what is causing this issue. check engine lights have nothing to do with oil level or pressure, they indicate electronic control problems with the engine, trans or emission system.

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It occurred to me that you may find it by unplugging wires on the few items under the hood which may appear they could be the oil pressure sending unit.

The light should go out when the wire is unplugged, and if it does it is bad. That's your continuity test.

If you unplug the oil pressure sending unit and the light does not go out, the cause of the oil light staying on is something other than the oil pressure sending unit.

RE pete cass posting: I believe that if the sensor is diconnnected, the oil pressure light will not light (at least because of the oil pressure sensor switch being disconnected) -- the symptom here is the light won't go off. The switch is closed with oil pressure below 10-15 PSI and open above that oil pressure -- this is a normally closed switch.

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It's normal for the oil pressure to fall off at idle as it gets warmer because the oil gets thinner. It should operate between about 20 and 60 lbs. If it drops below 10 lbs at hot idle, you may have some bearing wear or a worn pump.

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It could simply be maybe the person changing your oil never reset the light? or you have a oil pressure sensor leaking or not working.
most of the time its someone never reset the oil change light. even before it goes on it goes by mileage, so maybe it didnt go off yet cause you cnahged it a tad early.so noone even tried to reset it.

I guess you could have an oil pressure problem, but thats going the extreme route.. but if nothing else shows that could be a problem.

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