[Mankind]

Your remote start will not work until you clear the CEL. Headers can cause a CEL depending on the headers you run. If you are running lean then there is most likely air getting sucked into the intake that the sensor is not seeing. Therefore, it is not sending enough fuel to compensate. Recheck your fittings and be sure you tightened the sensor. Sometimes the tube doesn't go on the bottom of the intake all the way and you will suck air there. The SLP did not cause your CEL. The dealer will blame it on your CAI if you take it to them due to the larger amount of air vs the fuel. So check then recheck and if you find nothing put your stock box back on before you go to dealer.