Found several issues.
While replacing an air filter I found a few issues in air hose. There are a couple of cracks. One of them is huge ! I believe it has been a while and the car was driven with the cracked air hose. I'm wondering if this caused contaminated engine oil cap area. When I replace engine oil the cap and area where I pour engine oil is pretty dirty with dirts. I'm guessing the crack sucked all the dirt without air filter and contaminated the engine. I don't know how bad this could be but let me know if I there is some area where I look at which could be troubled with this crack. After fixing these hoses, I will go to the emission test again to see if this was the cause.