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I'm probably not going to be able to give you a proper diagnosis without knowing which codes are setting the check engine light. There are about 300 problems that can set the light. Most common thing for your vehicle with not running bad is what they call the DPFE (differential pressure feedback) sensor. It's basically a vacuum/pressure monitor for the EGR system and they get stopped up or corrode as they have exhaust gases running through them and are made from aluminum or plastic. If you post code numbers (go to advance or autozone and they will read them for free) and I can give you a better idea of what the problem is.
It could be as simple as a loose gas cap. The best way to find out is to check the codes stored in the PCM. The code with give you an idea what is causing the problem. If you don't have a tester to read codes you'll have to go to a repair shop, the dealer or a part store like Autozone.
CHECK OIL PRESSURE SHOULD BE 20 - 45 PSI @1500 RPM OR 40 - 70 PSI @1500 WHEN ENGINE RUN ROUGH OIL LIGHT COMES ON YOUR OIL LEVEL LOW OR OIL TOO CONTAMINATED.YOU NEED TO CHANGE OIL FILTER AND OIL.LOOK AT THE COLOR OF THE ENGINE OIL,LOOK MILKY COOLANT GETTING INTO OIL.SMELL OIL IF SMELL LIKE GAS FUEL INJECTORS DIRTY CAUSING FUEL TO LEAK DOWN INTAKE WHEN ENGINE OFF.