When the SES light came on ithe first time P0411 & P0303 came up. I replaced the spark plugs to try and eleminate the miss fire. Then noticed that the cover to the air filter was not sealed all the way. While changing plugs I unhooked the battery which reset the SES light. After on the 4 drive from work to home the SES light came back on. I had it scanned again and only code P0411 came up.