I have a check engine light with a code PO315 cant remove it any help I have a scanner I have disconnected the battery ect still the code

 

the crank sensor has to be relearned, this is acomplishe by using the dealers scan tool, take it in and have them perform the relearn and you should be back and business. this can happen after reprogramming with an aftermarket tuner. just tell them that you have a tune in the car and to not reflash it while performing the relearn