Intermittent Oil Pressure Light shows still, please help!

My car has been in and out of the shop for over a month, the mechanic who is a qualified Herman mechanic and always worked on my cars is even frustrated with it, the sensors were coming up as faulty when they scanned it so they changed the sensors, we've done an oil change, replaced the filter with an Audi one, cleaned pipes and checked for blockages, checked for leaks, checked the oil pump, the oil pressure has improved from good to great and has been tested. However after a few days of driving and only when the car goes above 4000 rpm then the light comes on and once you turn off and res
Experienced mechanics share their insights in answering this question :
Hi there. Check the oil pressure with the engine at 4000 RPM’s. If the oil pressure is normal and high, then the oil pressure sensor is failing due to engine harmonic vibrations.

If the oil pressure has dropped at 4000 RPM, then the oil galleries in the top of the block could be sludged up. Take one quart of ATF (automatic transmission fluid) and put it in the engine. Run the engine for 15 minutes. Drain out the oil and change the filter and put in new oil. The ATF will clean up all of the oil galleries and clean up the contaminants in the engine. If you need further assistance diagnosing your Oil Light issue, then seek out a professional, such as one from YourMechanic, to help you with your vehicle.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

If the oil light comes on in your car, it means the oil pressure is low. This is bad, and for this reason, if the oil light comes on while you are driving you should stop driving immediately, turn the engine off, and get your car to a certified mechanic.
Oil Level Is Too Low

The oil level dropping below the minimum dipstick line is one of the most common causes of low oil pressure. This can happen at any time, even if you`ve recently had an oil change. Over time, engines burn oil more quickly. This is due to piston rings wearing, seals leaking, and so on.

If you`re seeing your car`s oil pressure light flicker, there`s a chance your oil level might be too low and you may need to top it off. If that solves it, great! If the problem persists after doing so, there could potentially be an issue with your oil pressure switch that`s giving you a false alarm.
An inadequate amount of oil can cause a loss of oil pressure and can trigger either or both of your oil warning lights. Pull over and turn off your engine immediately. Let your vehicle sit for about five minutes so that the oil can drain back into the oil pan. Check your oil level.
Notes: Engine Oil Pressure Switch. Black, with 1.2-1.6 bar.
When engine oil pressure drops, friction between different parts increases. This results in a steep decline in engine performance. Watch out for common signs of decreased engine performance such as a reduction in fuel economy, loss of power, and engine stalling.
Conventional Oil vs Synthetic Oil

When you lower the friction and resistance inside the engine, like you do when you choose a low-viscosity synthetic oil, your engine doesn`t need to work as hard. It can rev up faster and, potentially to a higher max RPM.

There is no relation.
If the oil pressure warning light has come on but you have confirmed that the oil level is correct and the engine is running normally with no unusual noises or high temperatures, the problem may be a defective sensing unit. You may wish to have the oil pressure tested with a gauge.
If your oil light comes on while you`re driving, you need to stop right away and shut the engine off. If you`ve run out of oil, your engine may seize up and refuse to turn over. If the car abruptly stops while you`re driving, you might be in trouble.
When the low oil pressure light comes on, it is best to turn your vehicle off and not use it until the problem is fixed. While we understand this is very inconvenient, it is better than risking the dangerous amount of damage driving the vehicle may cause on your engine.
You should not take this situation lightly, as it is an indication that your engine has lost normal oil pressure. If you see this light on, we highly suggest that you stop driving your vehicle immediately and turn off your engine. Driving with this light on your dash can cause severe, irreversible engine damage.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

lost all oil pressure, replaced the oil pump, low oil sensor, oil pressure sensor, oil pan gasket,
ANSWER : The fuel pump will not stay on if you loose oil pressure. This is why it is shutting off. The loss of oil pressure may be from bad crankshaft bearings or camshaft bearings. The engine oil pan should be removed and the oil pump needs to be checked to ensure that you put in the pick up tube seal to the pump and connected the pump to the block. Then remove at least one main bearing cap and inspect the bearings for excessive wear and crankshaft damage. If you need some help with this, consider YourMechanic, as a certified technician can help diagnose the issue with your oil pressure firsthand and help you fix it accordingly.

Low oil pressure light comes on when idle. Check engine light is on as well. Both came on after getting an oil change 3 days ago.
ANSWER : It is possible that they put in the wrong viscosity oil. In rare instances, a defective filter will also cause low pressure. If there is too much oil, it will aerate and cause low pressure. Be sure the oil level is really not above "max". The P2187 code will appear if the oil fill cap is not tight but it will also appear due to a myriad of causes because that code only "generally" identifies a lean running condition. Consequently, numerous parts would have to be tested including the O2 sensor, gas cap seal, manifold air leaks, any vacuum leak anywhere including PCV and EVAP systems, exhaust leaks, and fuel system faults such as failing fuel pump, clogged filter and more. Since the car has relatively low mileage, you would not expect a failed oil pump, although the pressure sensor (or switch) could be bad. However, the occurrence of the oil pressure warning light is quite coincidental to the oil change, thus I would suggest bringing the car back and asking them to redo with a new filter and double check the viscosity of the new oil that they use. If the problem persists after that, you will have to test actual operating oil pressure (at idle for instance) as well as the oil pressure switch. Finally, if the oil pressure warning light comes on continuously, unless the warning circuit itself is malfunctioning, that means the oil pressure is too low to operate the engine without damaging it. Anytime the light comes on for more than literally an instant, you should shut down the car and thus an issue like this obviously has to be repaired.

If you’d like, a YourMechanic certified mechanic can come to your home or place of business to inspect the vehicle and perform an oil pressure light is on inspection to diagnose the vehicle and suggest potential repairs.

Intermittent Oil Pressure Light shows still, please help!
ANSWER : Hi there. Check the oil pressure with the engine at 4000 RPM’s. If the oil pressure is normal and high, then the oil pressure sensor is failing due to engine harmonic vibrations.

If the oil pressure has dropped at 4000 RPM, then the oil galleries in the top of the block could be sludged up. Take one quart of ATF (automatic transmission fluid) and put it in the engine. Run the engine for 15 minutes. Drain out the oil and change the filter and put in new oil. The ATF will clean up all of the oil galleries and clean up the contaminants in the engine. If you need further assistance diagnosing your Oil Light issue, then seek out a professional, such as one from YourMechanic, to help you with your vehicle.

Check engine light and oil light comes on before oil change?
ANSWER : Hi There,
As you may know, these lights are designed to come on at specific mileage intervals that are preset by the factory. When your mileage exceeds a certain amount relative to the last oil change, this will trigger the lights to come on. Typically this will include the oil light and the check engine light as there are also other basic service items that are checked during oil changes. I would recommend obtaining an owner’s manual for your car if you do not already have one. This will usually indicate the specific service intervals and recommended maintenance items for your vehicle at the various mileage intervals.

The tire pressure monitor will also come on when the air pressure in the tires has reached a specific threshold relative to the tire design specification. Tire pressure is also impacted by the outside air temperature. For every 10° drop in air temperature outside your tires will lose about 1% in PSI or inflation. As you may know, as the temperature of the air changes the density of the air changes as well causing the tire pressure to be impacted by this. When this happens, the sensors in the wheels will detect this change in tire pressure and cause the tire pressure light to come on. Aside from replacing faulty tire pressure sensors, another way to help prevent this type of fluctuation in tire pressure is by the use of Nitrogen in your tires rather than regular air. As you may know, air is approximately 78% Nitrogen, 21% Oxygen and the rest is water vapor and some other small concentrations of gases. Nitrogen is much less likely to migrate through tire rubber than oxygen. This will maintain your tire pressure much more consistently during large temperature fluctuations.

Oil pressure light won’t turn off
ANSWER : Hello. There could be an oil leak somewhere, or a problem with the car’s oil pump not working properly. It is also possible that the new oil pressure sensor that you just put in is defective and needs to be replaced. Have a certified technician, like one from YourMechanic complete an inspection to determine why your oil pressure light is on.

My car has low oil pressure. I’ve already changed the oil pressure sensor 3 times.
ANSWER : If you have replaced the sensor three times and it did not fix the problem, then you may have problems with the oil pressure being low at idle due to wear in the engine bearings. The reason it would be fine sometimes and not others may be due to engine load and temperature changes. Have the oil pressure tested at the sensor port to see if it is low and needs engine repairs.

I recommend having a certified mechanic, such as one from YourMechanic, come to your location to perform an inspection to determine why the Oil Pressure Light is on.

Hello Ben, my oil pressure is came on. Slight oil drip. Mechanic changed oil, replaced sending unit. Light came on after a day.
ANSWER : You need to have the oil pressure checked to see if the oil pressure is within specifications before you condemn the engine internal problem with oil pump or crankshaft and bearings. You may want to get the dealer involved now and let them take care of getting the light diagnosed.

Fit a modified AUDI TT oil pump to the car, replaced the oil pressure sensor, but oil pressure light still on! 2005 Volkswagon
ANSWER : Hello – I would first put a real oil pressure gauge on the port for the oil pressure switch and see what real pressure looks like before driving it. Low oil pressure light switches trigger at only about 5 psi, so if the switch/gauge are working correctly, you’ve got real problems (worn connecting rod and crankshaft main bearings most likely) with this engine. I recommend a low oil pressure inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.