I was changing the filter on my injen intake and i found oil puddled in the intake before the air sensor it looks like it came in through the breather from the intake to the valve cover. Also my check engine light was on but after I changed the filter and cleaned out the oil it went off.

Has anyone else had this problem?

 

Time for a catch can.....Have you had to hit the brakes REALLY hard recently? Get the computer scanned for any stored codes too. Just because the CEL goes out doesn't mean everything is cleared.