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it could just be a failing oil level sensor but it could be clogged up oil return passages
check the oil passages this way. first check you oil cold and fill to full, the drive your car until the can get the light to go on , pull over right away ,pop the hood and check the oil again , you have to do this fast like right then!, all within like 60 seconds from the time you shut it off till you know what the dipstick says!
if it's low you have oil being held up in the valve cover area this is most likely due to someone not doing oil changes regularly.
start doing oil changes. really often like every 2000 miles or so. this should clean your engine out
also take note of how quickly your engine oil turns black after an oil change , you should still be able to see through it on the dipstick for over a 1000 miles or more , if not you have dirty engine.
take it to autozone and have them hook it up to their pocket scanner, chances are you need a new gas cap but if thats what the scanner says you need to buy it directly from the dealer not from autozone
Because your car is consuming so much oil, you need to check the level often, so the level won't go down more than one quart. You will get an idea how long you can drive the car before it is down one quart, and should keep the level at the full mark. You should change the oil filter, as it is still collecting contaminants. Have you checked the spark plugs condition? It seems the oil consumption will result in the plugs being fouled soon . Keep that oil level up, or the result will be a seized engine. Also, I'm guessing the tail pipe shows black residue, another sign of high oil consumption. This is probably why someone sold this car, they didn't want to deal with an expensive repair of an engine rebuild. You are correct, an oil change should be done every 3k miles.
the check engine light is on most likely because you might have low fluid levels either oil , or coolant. if the levels are good there is an active code in the ecm. if your vehicle has been running rough it is most likely due to a bad O2 sensor. please rate this solution.