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Low oil pressure warning kept coming on. I changed the oil pressure sending unit/switch but it keeps coming on. is there a reset procedure?

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Posted on Jan 02, 2017

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SOURCE: Replaced Oil Filter Adapter Gasket 1995 Mercury

We performed exactly the same repair on December 28, 2010 withexactly the same outcome. Finding no other references to this oil pressureproblem anywhere on the internet and the fact that they both happened the samemonth, I can only wonder if there are some incorrectly made gaskets hitting theshelves.

Posted on Jan 03, 2011

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Why does the oil warning light come on when the oil level is full oa a 1987 dodge ram 50 truck


Your oil light is not a level indicator, it is a pressure indicator. If your oil light is on with the engine running, it either means that you have a bad pressure sender or you have no oil pressure. I suggest installing a mechanical pressure gauge to verify if you do or do not have oil pressure. If with the mechanical gauge you do prove to have oil pressure then simply change your oil sending unit. But if you do not have oil pressure with the mechanical gauge, then you must drop the oil pan and find out why you have no pressure.

Jul 13, 2015 | Dodge Cars & Trucks

2 Answers

Low oil pressure warning


It sounds like the oil pressure sending unit is going bad. Sometime they're called oil pressure switches. That would be my first guess. Why its proportional to 1/4 segments of gas portions makes very little sense. Fuel level sending units work as semi circular resistance sweep. Not in segments the only thing that segments fuel protions are the lines on your instrument panel gauge. Anyhow check the fuel pressure switch.

Feb 23, 2013 | 2006 Ford Taurus

2 Answers

How can i fix the oil pump


see this tips and fix it. God bless you
The oil pump supplies oil to lubricate your engine. If the oil pump is worn or is not turning, the engine will suffer a loss of oil pressure, which may result in engine damage or engine failure.
The first sign of trouble may be a low oil pressure warning light, a drop in the normal reading on you oil pressure gauge (if your car has one), or the appearance of ticking or clattering sounds from your engine.
As a rule, most engines only need about 10 PSI of oil pressure for every 1,000 RPM of engine speed. Oil pressure will read higher than normal when a cold engine is first started because the oil is thick. Oil pressure will gradually drop as the engine warms up and the oil thins out. So normal oil pressure on a warm engine cruising down the highway is typically 30 PSI up to 45 PSI.
SYMPTOMS OF OIL PUMP TROUBLE
The first thing you should do if any of these symptoms occur is to stop your car, turn off the engine, let it sit for a few minutes, then check the oil level on the dipstick. If the oil level is at or below the ADD line, add a quart of oil to bring the level back up to the full mark. Add as much oil as is needed to raise the level to the full mark. Then restart the engine. If the warning light remains on, or the oil pressure reading does not climb back up to its normal range, or the engine noise does not go away, you may have a bad oil pump.
The other possibilities include a bad oil pressure sending unit, or a problem with the oil pressure warning light circuit or oil pressure gauge.
OIL PRESSURE SENDING UNIT
If the engine is NOT making any unusual noises and seems to be running normally, and the oil level on the dipstick is FULL, but you are still getting a low oil pressure warning light or low gauge reading, the fault could be a bad oil pressure sending unit.
The oil pressure sending unit is mounted on the engine block. On some applications, there is a spring-loaded pressure-sensitive diaphragm with a switch inside the sending unit. This switch completes the circuit to the low oil pressure warning light if oil pressure drops below a certain threshold. The unit may stop working if the diaphragm inside fails, if the switch is stuck, if the small hole that allows oil to enter the sending unit becomes plugged, if there is a loose, corroded or broken wiring connector at the sending unit, or there is a fault in the wiring circuit between the sending unit and warming light.
On vehicles that have an oil pressure gauge (electronic, not mechanical), the oil pressure sending unit has a small rheostat inside that sends a variable voltage signal to the oil pressure gauge when the diaphragm moves. A worn spot on the rheostat or any of the other problems just described for the simple pressure-type oil pressure switches can cause a problem.
FORD'S FAKE OIL PRESSURE GAUGE
On many Ford vehicles that were built from 1980 through the 1990s, the oil pressure sending unit has two switches, a low pressure and a high pressure. These vehicles also have an oil pressure gauge, but the reading on the gauge is not a true indication of real oil pressure. As long as the pressure to the sending unit is between high and low, the gauge will read normal. If oil pressure drops and trips the low pressure switch, the dash gauge will now read low. Or, if oil pressure goes up and trips the high switch inside the sending unit, the dash gauge will read high. Consequently, don't rely on the oil pressure gauge for an accurate reading in these vehicles. It is only a gross indication if the oil pressure is low, normal or high.
OIL GAUGE PROBLEMS
If the engine is NOT making any unusual noises and seems to be running normally, the oil level on the dipstick is FULL, and you have replaced the oil pressure sending unit but are still getting a low oil pressure reading on the dash gauge, the fault could be in the wiring circuit between the sending unit and gauge, or the gauge itself might be bad.
Check the wiring connections on both ends as well as wiring continuity between the sending unit and gauge. If no wiring faults are found, hook up a pressure gauge directly to the oil pressure port on the engine and check oil pressure with the engine running. If the engine-mounted gauge shows normal oil pressure but the dash gauge is reading low, the problem is a bad dash gauge.
On the other hand, if the engine-mounted pressure gauge reads low and you have done all of the above, chances are the oil pump is worn, or it is not picking up enough oil because of a restriction or blockage in the pickup screen in the bottom of the crankcase.
OIL PUMP PICKUP PROBLEMS
The pickup tube has a screen on the end to prevent large chunks of anything bad that ends up in the crankcase from being sucked into the pump. But we are talking BIG chunks of debris, not normal wear particles or carbon or dust or other microscopic-sized abrasive particles that can cause pump wear over time.

Sep 28, 2012 | 1996 Toyota Tercel

2 Answers

Oil lights stays on


If the engine is not making any noise then it is likely not a real oil pressure problem. Just to make sure have the pressure checked by a shop with a mechanical test gauge and if found to be inspect replace the sending unit and that should in most cases cure the problem. I assume this is a pressure indicator.

Sep 17, 2012 | 2005 Dodge SRT-4

1 Answer

Low oil pressure warning keep coming up but my oil pressure is fine


Could be a few things, first Get it checked with a mechanical gauge to test low motor oil, clogged oil filter, bad oil pump, clogged oil sump (pick up tube) or bad oil sending unit. Then replace sending unit sensor.

Mar 01, 2012 | 2006 Chevrolet Monte Carlo

2 Answers

1993 VW golf 1.8. oil is leaking from oil pressure sending unit, i've replaced the unit but now the low oil warning buzzer is going off (didn't previously do this) and warning light stays (also not a...


It seems the fault is with the oil pressure switch you have replaced. This switch seems to need a higher pressure to cut off and the oil pressure light is coming on because it indicates low.
So if your oil is good , the oil filters were changed recently this fault must not come up. if not replace oil and oil filters to check but keep this option that the fault was never there earlier and a new part can also be faulty.

Sep 24, 2010 | 1993 Volkswagen Golf

3 Answers

Oil light came on. On Interstate and drove about 9 miles to next exit. Car died on exit ramp. Will not start. Oil was about 1.5 qts low. Filled it up, but still won't start. Is there some automatic shut...


Only 1.5 qts low would not shut the engine off. It sounds like your oil pressure sending unit needs to be replaced. If the Oil pressure sending unit reads less then 8 psi or thinks there is less then 8 psi the ECM will shut the engine off. It's a simple fix and the sending unit is on the drivers side behind the distributor on the engine block. You can pick one up from Auto Zone and they can give you the step by step instructions to replacing the unit. As long as there was no bad noises coming from the engine when it shut down, it should be a simple fix. If there was any bad noises coming from the engine, then your oil pump may have gone bad and will need to be replaced and hope nothing else has failed or have gotten damaged due to lack of oil pressure. Good luck and keep me posted.

Dec 07, 2009 | 2000 Chevrolet Tahoe

1 Answer

OIL PRESSURE WARNING LIGHT STAYS ON IN 2001 LINCOLN TOWN CAR. CHANGED SENDING UNIT,STILL THE SAME, INSTALLED A TEMPORARY "MECHANICAL" OIL PRESSURE GAUGE TO CHECK OIL PRESSURE AND GET 35 P.S.I. CHECKED...


The oil pressure switch is a short circuit when there is low oil pressure. Removing the wire from it should turn off the warning light. If it doesn't, the chances are there is a short circuit between the lamp and the sensor.

Sep 24, 2009 | 2001 Lincoln Town Car

3 Answers

VW Golf 4 GTI, Oil pressure and vehicle wont start.


If your oil pressure light comes on
Don't ignore it. An oil pressure warning light (or low gauge reading) means one of two things: either your engine has dangerously low oil pressure (for a variety of reasons which we'll get to in a minute), or the oil pressure sending unit that triggers the warning light (or operates your gauge) has failed.
The question here is whether you have a serious problem or a minor one.
First, do not keep driving if the oil warning light is on or your oil pressure gauge has dropped. Stop the engine, let it sit for a few minutes, then check the oil level.
Is the level low? If the oil level is down more than two quarts or no oil is showing on the dipstick, adding oil to bring the level back up to the full mark may be all that's necessary to make the light go out. Just keep your fingers crossed that you haven't damaged the engine from running it too low on oil. If you hear rapping or knocking noises the engine starts, you're too late. The damage is done and now you're stuck with the consequences.
Note: On some late model vehicles, the warning light will come on (or a message will appear) if a sensor in the oil pan detects a low oil level. The light is supposed to come on before the level gets low enough to cause any damage.
If your oil level was low, it means your engine is either leaking oil or burning it. Leaks can be fixed by finding and replacing leaky gaskets and seals. Sometimes the oil filter will leak if it isn't installed or tightened properly. But an oil burning problem means the valve guides, rings and/or cylinders are worn or damaged and more costly repairs are needed.
If the dipstick shows a full oil level, then low oil obviously isn't your problem. The oil pressure may be low because of a worn or broken oil pump, a plugged oil pickup screen in the engine's crankcase, possibly a plugged oil filter or excessive bearing wear. Or, the oil pressure may be fine but the oil pressure sending unit has failed. Further diagnosis will be required to determine what's wrong.
Should you attempt to drive your vehicle home or to a service facility?
It's risky. If the problem came on suddenly, your engine does not have a lot of miles on it (less than 60,000) and you noticed no unusual noises (no valvetrain clattering or engine knocking), there's a good chance that all that's wrong is the sending unit. But, there's no way to know for sure without actually checking the engine's oil pressure with a gauge, or replacing the sending unit to see if a new unit makes the light go out. If the problem is only the sending unit, your engine still has oil pressure and you can continue to drive it until the sending unit can be replaced. But, if you're wrong you risk ruining your engine.
If you think you might have a low oil pressure or oil delivery problem because of a bad oil pump or one of the other problems we mentioned, do not drive your vehicle. Doing so only increases the probability of further engine damage. Have the vehicle towed to a service facility for repairs.

Aug 22, 2009 | 2000 Volkswagen GTI

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