Oil Pressure Gauge

My oil pressure gauge is reading zero like it has no oil pressure at all the check engine light is on and also the check oil pressure gauge does this mean that my oil pressure sensor is bad.

My car has 107300 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
This light will usually come on when one of two things are happening. Either the motor is in fact low on oil or the oil pressure sending unit is not working properly and may be producing a faulty reading. I would recommend first, to check the actual oil level in the motor by using the dipstick. Be sure the oil level reaches the "full" mark. If this registers as "full" then you likely have a faulty oil pressure sending unit. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle to determine what may be causing your low oil pressure light to come on.

How to Identify and Fix Common car Problems ?

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When the oil warning light comes on, it is a sign that the engine oil pressure has dropped to a low level, which is dangerous. An engine running with low oil pressure can quickly destroy the engine.
Best Answer. Hot at idle 35-38 psi at 700 rpm, 1500 rpm 55 psi stable, at 2200 rpm 60 psi new oil pump and the Engine is a 5.3 B code Engine with 237000 miles.
Oil Pressure Gauge Bounces

A low oil level could cause the gauge to drop out when turning or accelerating, if driving a vehicle or marine vessel. This could also signal the use of low quality oil or that your oil has become diluted or contaminated somehow.

Normal engine oil pressure is between 25 and 65 PSI. While the ideal oil pressure can change depending on the make and model of your car, the general rule is that oil pressure should be above 25 and below 65 PSI (pounds per square inch).
The ideal oil pressure varies depending on the car brand and model, but generally, the ideal oil pressure is between 25-65 PSI.
One common problem seen in the 5.3-liter engine is a failure of the valve cover to seal, which can cause heavy oil burn. Depending on the wear-and-tear on your vehicles, you may be able to get away with having the rings cleaned and getting a replacement valve cover that will seal again.
The engine oil pressure sensor, also known as the oil pressure switch or oil pressure sending unit, is a small component installed between the oil filter and your car`s oil pan. The sensor plays a vital role in making sure your engine functions well.
Like most measurements in your vehicle, your oil pressure is indicated on your dashboard. You`ll likely find a dial with an indicator needle beneath a label that says, “Oil.” However, some vehicles simply use an “H” or an “L” to let you know if your oil pressure is high or low.
The oil pressure gauge will usually drop when a few things could be happening. Either the motor is in fact low on oil, the oil pump could be failing or the oil pressure sending unit is not working properly and may be producing a faulty reading.
Zero Reading

This is normal only when the vehicle is idling. If this reading occurs at higher speeds it could mean one of three things: 1) the gauge is faulty, 2) the oil level is low, or 3) the oil pump (or its drive) is broken. In any case, switch the engine off and get your engine checked out as soon as possible.

A faulty oil pressure sensor or oil pressure switch can falsely signal a low oil pressure condition, causing the oil pressure warning light to turn on.
An oil gauge is a rod that shows the oil level in an engine oil pan or transmission.
The Oil Level Indicator (OLI) was developed in response to the need of maintenance professionals to gauge the oil level inside large tanks, gearboxes and reservoirs.
The oil pressure light is often triggered due to very low oil or no oil in your engine. This could be because the oil hasn`t been changed in much too long or there is a major oil leak. Your oil filter can also be clogged, usually because of the lack of regular oil changes.
The Oil Level Indicator (OLI) was developed in response to the need of maintenance professionals to gauge the oil level inside large tanks, gearboxes and reservoirs.
Like most measurements in your vehicle, your oil pressure is indicated on your dashboard. You`ll likely find a dial with an indicator needle beneath a label that says, “Oil.” However, some vehicles simply use an “H” or an “L” to let you know if your oil pressure is high or low.

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.

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Truck has oil in it but when i am idling at a stoplight, the oil pressure gauge drops and says low oil 2003 Dodge Ram 1500 4.7L
ANSWER : Hello – assuming an adequate oil level, which you have checked, there may be a real oil pressure problem. It’s worth checking with a know working oil pressure gauge, so that you can get the real readings (i.e. 40 psi at running RPM, 10 psi at idle – both hot – would be acceptable). It’s expected that your oil pressure will drop at a hot idle, as long as you have good pressure above idle. Low hot pressures all around are indications of excessive connecting rod or crankshaft main bearings, camshaft bearings, or oil flow bleeding off elsewhere in the engine. For professional assistance, 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.

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Are there accurate electrical oil pressure gauges that will beep me when my oil pressure goes too low and how do they work?
ANSWER : Oil pressure reporting systems with programmable audible alarms are readily available. An example is the CruzPro Digital Gauge but there are many other vendors and you really have to do a product comparison and look at all the reviews. Once you select an audible alarm based system, if you desire a professional installation, you can use YourMechanic’s oil pressure sending unit service page to request installation. Of note, most damage to engines related to oil starvation occurs in the few seconds after starting. Therefore, I would recommend you FIRST install a pre-pressurization system as that will give you the most bang for the buck and indeed solve what is an immediate problem in all engines. An example of this product is the Insta-Lube Engine Pre-Lube Kit. Again, though, there are many variations on this solution. I highly recommend pre-lube and the only reason all engines do not have it is such a system adds cost and complexity to motor vehicles but it solves a real problem. A certified mechanic from YourMechanic can install such a pre-lube kit as well, if you desire. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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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.

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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.

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Does my vehicle have an oil pressure sender or oil pressure sensor or both and where is it located?
ANSWER : Your motor (454/7.4L Big Block Chevy) should have an oil pressure sending unit that is typically mounted just above the oil filter housing. This is a relatively small unit (about the diameter or a quarter or slightly bigger) with threads going into the engine block and a line coming out of the other side of the unit. Your oil pressure fluctuation sounds like this may be a case of a failing sending unit. If you are not able to replace this on your own, feel free to schedule an appointment with one of our expert mechanics here at YourMechanic to come to your location to replace your oil pressure sending unit.

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replace oil pump and pick up tube
ANSWER : Hi there. Typically when the oil pressure changes based on the type of oil you are using, it’s an issue with the pick-up itself. Quite often, the wrong sized or style of oil pump or a pick-up line that is too short / long, can cause inconsistent oil pressure. It’s also possible as you indicated that the oil pickup screen is clogged with sludge or debris (especially if the engine has not been rebuilt). It might be a good idea to have a professional mobile mechanic complete an oil pressure light inspection to help you pinpoint the source of the issue and recommend the right repairs.

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Chevy 5.3l – Lost oil pressure, why?
ANSWER : Hello – since you didn’t appear to be leaking oil in a significant way (busted oil line, hole in the pan), I suspect that the oil pressure relief valve may have been stuck in the "relief" position. Some of the early 5.3l engines had trouble with this – galling in the pressure relief valve bore. Pull the plug, spring and ball out to be sure the spring hasn’t broken. Light tapping on the block may be required to release the stuck valve. Good luck!

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