Installing an AFE intake should not cause any check engine lights as these intakes do not require any special tuning. The fault you listed is as an issue with the Crank Case Breather system, and a quick google search turned up this: http://obdii.pro/en/code/P04DB . We can shut off this trouble code in a tune, but we cannot answer as to whether that would affect passing an emissions inspection. In general, you should return your vehicle to stock, both tune and parts, when going in for an inspection. It might be a good idea to double check the installation and/or contact AFE directly about this issue. If the intake is for your model year truck, and is installed properly, you should not be seeing any check engine lights.