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What causes a low oil pressure light to come on

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The light it controlled by an oil pressure sending unit. These can go bad and turn a light on even if you have good oil pressure, but...
You need to get a "mechanical gauge " hooked up where the sending unit is to verify if you have good pressure or not. Low oil pressure is due to, low oil, worn out oil, excessive bearing wear, or a failing oil pump.

Posted on Oct 13, 2010

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I have a 2015 volkswagon passat. And the low oil light keeps coming on and I checked the oil yesterday and the light went off and came back on today. But it's not the oil pressure light. ?


Keith, it probably is the oil pressure light.

Low oil level causes low oil pressure. But, as you say .. your oil level is okay. It may be the oil pressure sender which is at fault. There's every possibility that your oil pressure is fine, but the sender is sending a false signal to your dashboard which gives the 'low oil level' warning light.

Get the mechanic at your local dealership to stick his head under the hood. You'll get a diagnosis in seconds. I don't think you have too much to worry about .. just that 'low oil level' warning light is a bit unsettling ..

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Can the tensioner make the chain to be loose inside the engine an cause it to make noise an show sign of oil on the dashboard?


A loose timing chain tensioner will not cause the oil lamp to light. The noise you are hearing is most likely valve noise due to oil starvation. The oil light comes on when the oil pressure is too low to be safe for the engine. Most people believe it is to tell you the oil level is low. A low oil level can cause low oil pressure is the oil is below the sump, but low oil is not the cause of the light - low oil pressure is. This can be due to a number of things, such as a bad oil pump, faulty bypass regulator at the oil filter, loose sump pipe connection, or even an oil gallery plug that comes out internal to the engine. You need to stop using the vehicle immediately and have the oil pressure checked with a mechanical guage to determine if the problem is the oil ressure or the sensor that lights the light. The chain tensioner being loose CAN cause noise, and that itself is an issue that should be fixed, as in many vehicles a loose chain can jump time, or jam and break, and since many cars have interference engines, either of these scenarios can cause severe internal damage to the engine.

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What does low oil pressure on 2008 Chevy Impala 3.5 V6 LS


Do you mean what causes low oil pressure? This is a very reliable engine for the most part. If the oil light is on or gauge is reading low, have the oil pressure sensor inspected for failure. These sensors do go bad.

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Why would the oil light stay on?


That depends on the type of oil warning light being displayed. There are 2 types of warning lights

1. Low oil pressure light which all cars have
2. low oil level light which some cars have.

Low OIL PRESSURE warning means the oil pressure is below minimum and when this happens there will be insufficient lubrication of many engine parts because sufficient oil cannot get to all parts of the engine it is required to lubricate. Until the cause is identified and rectified the warning light will remain. If you run your engine with low oil pressure you will cause expensive damage to internal engine components.

Low OIL LEVEL warning means the oil in the sump has dropped to a dangerously low level (which may be due to an oil leak or abnormal oil consumption by the engine.) This warning means the oil level needs to be topped up and the warning will stay displayed until you top up the oil. Running the engine with low oil will cause expensive engine damage.
Since it is a 2 minute job, Oil levels should be checked fortnightly as a minimum, together with radiator coolant and power steering fluid levels, if you run the car most days each week as most people do.

It is possible for a warning light to remain displayed when the cause has been dealt with because there is a problem with the sender unit. However it needs to be established with alternative checks that the problem has been fixed before investigating if there is a problem with the warning light itself.

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Where is the oil senor for the dash light


Its on the engine but you will have to specify the make and model of the car to get the exact location of the sensor. The light indicates low pressure so it is probably near the oil pump. Most of the time when the light comes on the oil level is too low, causing pressure to drop. You can check the oil level with the dip stick. Do not drive your car with the oil light on. Low pressure can cause significant wear on the engine in a short time and eventually cause the engine to seize up completely.

Nov 27, 2014 | Cars & Trucks

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Low oil pressure light when accelerating hard


This may sound too simple, but is your oil level sufficient? Some cars have the oil pump at the front, if the oil level is low and you accelerate, the oil is pushed to the back of the oil pan and the oil pump draws air and cavitates, causing momentary low pressure. If that's not the case, I suggest you hook up a direct reading oil pressure gauge, because it sounds like you have an actual oil pressure issue.

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What reason is caused?A BMW X5 engine oil pressure warning light


May be due to oil pump wear, filter blocked by dirt, oil filter is exposed out of the oil surface, the oil level is low, the oil mixed with air and the pressure gauge is caused by the failure of the. In addition, the oil viscosity is low, the oil seal and poor lubrication, lubricating oil viscosity is too large, too cold oil sludge deposition too much also can cause the oil pressure indicator display abnormal.
source: obd2 tool car diagnostic

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1 Answer

Getting a "Low Oil Pressure" message on the dash board.."Turn off engine" any ideas of what the problem might be?


Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch).

Jan 11, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Oil lite came on right after oil pan gasket


Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch).

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