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What could be wrong when the engine light comes on. Oil Change has already been done.

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Basically we have old cars I have a 2000 its all in the wiring I have had mine checked over and over also car might be burning more oil as well so check it once in a while but its probley wires

Posted on Jul 24, 2009

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I have an 2005 FORD Focus Zetec. After a long run 30 miles the oil light will come on when the engine is idling at about 1,000 revs. It doesnt do this on shorter local trips.


have a oil pressure test done using a mechanical gauge
that will determine if oil pressure sender unit is operational or not
that will then decide if the oil pump is failing
if the engine is original then it may be worn at points that is allowing excessive passing of oil ( hydraulic belt/chain tensioner) rocker arm bushes, big ends , mains, valve for the camshaft position control
The oil you should be using would be a 30w50 viscosity

Jun 04, 2016 | 2005 Ford Focus

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3.5L V6. Why does oil pressure light turn on intermittently?


1. As a basic measure I would make sure the correct grade and spec oil is going in the engine. You can no longer trust that a local mechanic or even a dealer service center will necessarily use the required product as stipulated by the manufacturer. It is always better to buy and supply your own so you know the correct product is being used.

2. I would not assume there is a problem with the oil pressure warning light even though there could be.
The first thing the mechanic should have done when you reported the oil pressure issue is to hook up an independent mechanical oil pressure gauge and check oil pressure when the engine is hot at different RPMs. Any oil pressure issue will usually show up at idle when the engine has been warmed up properly and the engine oil is hot (unless you have some kind of intermittent oil pressure relief valve that is sticking). Just replacing parts without actually knowing what the oil pressures are at different RPMs is being sloppy and negligent.
This is what you need to do now. Contact a business that can hook up their own pressure gauge to your engine and have them check the oil pressure readings at various RPMs when the engine is fully warm. If there is a low oil pressure issue it will show up on the oil pressure gauge. As you have a new oil pump there should be no issue now with oil volume or a sticking oil pressure relief valve which on your engine should be part of the oil pump assembly.

3. Worn engines will not be able to sustain required oil pressures. Oil pressure is not produced by the oil pump. The oil pump produces oil flow but the resistance to flow is what produces the oil pressure and that resistance is created by fine clearances between operating engine parts especially on the crankshaft and components connected to it. Once the engine wears the clearances increase and the oil flows past the parts much more easily and produces/builds much less pressure.
How well your engine with over 90000 miles has been maintained depends on how often all the owners changed the engine oil and filter , whether they kept the engine oil level up to full (most owners rarely ever check oil levels between services) and whether they always used the correct product. Manufacturer oil change intervals shown in service schedules can be 10000, 12000 miles or more which is much too infrequent for the type of use 95% of private vehicles experience which typically are on the severe to very severe use end of the spectrum. Engine oil typically needs to be changed at least at half the mileage shown in service books (at least twice as frequently) and thus at least every 5000 miles if you want your engine to last.

Feb 01, 2016 | 2011 Hyundai Santa Fe

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Oil min light keeps coming on


What kind of oil? Is its not synthetic it's wrong...the Audi engines have a small oil pickup tube and the cheap oil gunks up the engine and clogs pump screen causing light to come on eventually engine failure....you need to flush engine ....you can use kerosine or go to parts store and tell them you want to clean the internals of gunk ...pour in engine oil let run for few min drain oil ...buy cheap oil for this do same thing 3 times ...when light goes off your done fill with fully synthetic oil and you just saved your engine ...only synthetic oil

Jan 11, 2014 | 2001 Audi A4

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Low oil pressure light comes on when i stop giving the car gas like when i come to a stop sign or light and every now and again the check engine light comes on. I change the oil to a heavier oil and the...


This may mean engine wear or bad oil pump. I would have the oil pressure tested to see if its a shot some where or if the pressure is really low, this is done by removing the sensor and installing a gauge and driving the car to see if the pressure is low, if the pressure is low then more checking is neede to see why,you may have worn engine bearings or bad oil pump. depending on the mileage it may be smarter to replace the engine, not knowing what internal damage has been done already. good day.

May 10, 2011 | 2006 Pontiac Grand Prix

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1998 Buick Park Ave., Check engine light is on, the computer displays Oil Change


The check engine light and the oil change indicator message are more than likely not related. You can toggle through the functions and get the oil life % to display then push the reset and hold it for a few seconds and it will reset the oil life indicator message. It should read oil life 100% after reset. (I would change the oil and filter if you have not already done so.)

The check engine light means you are setting an engine code, if it stays on, it is a hard code, if it is intermittant it is a soft code. Have it checked with a scan tool -- plug into your a.l.d.l. connector below the dash on the drivers side and read the code. Autozone and other places will do this for free.

Sep 28, 2010 | 1998 Buick Park Avenue

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Service engine soon message comes on. the car is really not due for oil change since only 2,000 since last one. What is the message really telling me. Is it looking for oil change, etc or maybe something...


Service soon light means, that the computer pick up a bad signal from one of your engine sensor, have a code reading done, get back with us with the code number so we can help with your troublr code, autozone will do this service for free.

Aug 10, 2010 | 2002 Mitsubishi Mirage

1 Answer

Service engine light


Light came on due to the engine computer pick up a bad signal from one of your engine sensors, will have to get a code reading to know what's going on, most auto parts will do this service for free or some one like autozone, have it done and get back with us with the code number, so we can help you with your trouble code.

Jul 22, 2010 | 2004 Mitsubishi Lancer

2 Answers

Oil maintenece light is on. Oil level is good. Could a clogged filter make this light go on?


This should only be indicating time for an oil change. Now, if the red, check engine light comes on, then you have an oil/engine problem.

Possibly the maintenance light wasn't reset when the last change was done. If you don't have the owners manual to check, I found a referenced method (below) to reset it through AMSOIL synthetic oil products. Good Luck

To reset Engine Oil light. Turn the ignition key to RUN with the engine off. Fully press and release the accelerator pedal three times within five seconds. If the Change Engine Oil light is flashing, the system is reset. The light will flash for up to 30 seconds or until the ignition is turned off. If the light comes on again and stays on for 30 seconds at the next ignition cycle, it did not reset. You will need to reset the system again.

Feb 09, 2010 | Saturn L-Series Cars & Trucks

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