Engine oil light flickers when I make a stop

I'm having trouble with the engine oil light flashing on and off when I stop at a red light and then it stops flashing when I start driving again. I checked the oil and fluids and all seem okay. What is causing this?
Experienced mechanics share their insights in answering this question :
The light is flickering on and off due to the oil pressure being low below 4 psi at idle or the oil pressure sensor is not working correctly. The only way to know for sure is to do an oil pressure test. The engine should have at least 4 psi at idle and above 25 psi at 3000 RPMs. If the oil pressure is below 4 psi at idle, then replace the oil sending unit. If the pressure is at zero at idle, then you will need the oil pump and screen replaced or at the very least checked. Also, check the engine for any bearing damage when the oil pump is replaced. A certified technician will be able to perform these tests and diagnose why this warning light appears for you.

How to Identify and Fix Common car Problems ?

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

The oil pressure in your car increases when you accelerate and decreases when you brake. If the sensor goes bad, it may not correctly read the drop in oil pressure, which will cause the light to flash when braking.
Two reasons for your oil light to flicker. 1. low oil pressure, meaning you need to top up your oil. 2. faulty oil pressure switch, meaning you might need either a new oil pressure switch if it is defective.
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.
It`s very likely that your car is low on oil. When you turn a corner, tho oil in the oil pan moves away from the oil pickup tube. When the oil level is low, the oil pickup tube becomes completely removed from oil, and starts to make no oil pressure, causing this light.
Generally speaking, you have about 2 weeks or 500 miles of driving before a flashing oil light turns into a legitimate problem. But once it hits that point, things can go downhill fast, leading to serious mechanical damage. So, try to get your vehicle into a mechanic sooner rather than later.
Contact problems, faulty wiring connections, worn-out receptacles, or a bad filament can all cause flickering. Often, these problems occur as the light bulb ages. They could also happen as the result of wear-and-tear, improper voltage, or bad wiring inside the fixture.
If your engine is low on oil but there isn`t a leak, that means it`s probably being burned inside the engine. A bad PCV valve is a frequent culprit in the case of burning oil–but what is it, exactly? A PCV valve is designed to let air escape when the pressure in the crankcase is too high.
Low oil pressure can be caused by a clogged line, a bad pump, or a clogged filter. The low oil pressure would rob the engine of the oil it needs and produce a knocking sound. The oil pressure can be tested with a gauge.
A damaged oil pump (possibly caused by interference with the AC compressor bracket) can also cause a knocking noise from the engine compartment; a modified bracket is available from Dodge.
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.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Check engine light refuses to go off after engine replaced
ANSWER : Hello there, you have a long series of issues going on with your 2013 Hyundai Sonata. If you keep getting a repeating oil light on than there is likely a fault in that system.

Since this fault has lasted after the engine was replaced it could be a oil pressure sensor, wiring harness fault, ECU fault, oil pump, oil strainer clogged, or low oil pressure.

To diagnose this issue properly you need a complete vehicle inspection to start from square one and identify the root cause of all this.

My Hyudai elantra 2014 stalled and stopped after the battery light, engine light and oil light came on
ANSWER : Hello, thank you for writing in. With check engine lights on, the first step is always scanning the vehicle for codes. These help direct your attention and ease diagnostics. The main concern is that the engine is making a loud noise. We need to determine if the noise and the battery or oil light are related. A major issue with the engine would effect the alternator charging the battery, the oil pressure, and several other components. However issues with the drive belt and other components can play a factor as well. Electrical and charging issues can cause various sensors to fail, and cause other warning lights to turn on. Only further inspection will tell, and you may need to get a second opinion. For help from our technicians, contact our service department to schedule an appointment.

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.

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.

Would low engine oil cause the check engine light to come on in my 2002 Toyota Corolla
ANSWER : Hello. Typically low engine oil will not cause the check engine light to come on in your vehicle. Unless the oil level is low enough to cause a drop in engine oil pressure, the oil light will not even come on. I am glad that you checked the oil though before it caused any issues. Since the check engine light is on the computer needs to be scanned for codes. With the codes I would be able to diagnose what is going on with the car. It may be as simple as a loose gas cap or it may be something more serious. If you are going to have this fixed, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the check engine light is on] https://www.yourmechanic.com/services/check-engine-light-is-on-inspection

I Had my oil changed on 5/28/16. On 5/31/16 the check engine light came on. On 6/5/16 the low oil pressure turn off engine came on
ANSWER : Hello,

From what you describe it would not appear to me that something went wrong during your oil change.

If the level is correct on the dipstick and the engine runs and sounds okay, then it is probably something else.

A likely cause for a problem such as this can be a defective oil pressure sensor, or wiring.

Virtually all vehicles have a dedicated oil sensor that will monitor oil pressure of the engine and set off a warning light if it falls to low, in order to protect the engine. If the sensor fails however, it can send a false reading to the computer or gauge, and cause the warning light to activate by mistake.

I would recommend having the vehicle’s oil pressure sensor tested for accuracy, and if necessary the engine’s oil pressure to make sure that there is no issue with the oil pump or system of the engine, as unlikely as that may be.

I’d recommend having a certified mechanic inspect the vehicle for you, they will be able to check for these failures and diagnose your Check Engine Light in order to get your car running normally again.

Regards,

Eduardo
YourMechanic

Car started to slow down and then the check engine light, battery, and engine oil light came on. What could cause this?
ANSWER : Hi there. It is possible that the battery cable came loose or the wires to the oil pressure sensor has came loose or failed. Check the battery cables and make sure that the terminals are tight and clean. Check the wires to the oil pressure sensor and make sure that they are connected and not broken. If everything looks good, then the oil pressure sensor may have failed. Plus, check the computer for codes and see what is stored. This will lead you to the part that could have failed. I recommend replacing the oil pressure sensor then checking to see if the lights will go out. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from Your Mechanic, that can assist you with the warning lights that came on.

2012 equinox reduced power light engine light and traction light came on. Lost a lot of power got home and all light except engine
ANSWER : Your car has what is called a "safe mode" that will be engaged by the computer when it detects that something critical has gone wrong related to any of the major components in your engine chassis or power train. This may be related to a number of things, most of which should have been registered in the computer when the check engine light came on. I recommend having an expert from YourMechanic come to your location to inspect your check engine light and diagnose any codes registered by your vehicle’s computer.