Does disconnecting the battery completely remove codes or are they stored until a code reader clears them? I put in a new BBK CAI I got for christmas and I started the car before I connected the MAF plug. (opps forgot) The check engine light came on immediatly. I turned the car off and plugged the connector in and now the light is off. I am wondering because I have to go thru MD. Emmissions in two weeks and I do not want any codes in the Computer. Will disconnecting the battery clear any and all codes the car has saved? Thanks Travis