can i get codes out of my 928s without a reader

No,that would be impossible. You will have to first find the OBD port on your car, (usually found under the dashboard on the driver's side). If you can't find it then you should take it to your local repair shop and have them tell you where it is and what type, (i.e-OBDI or OBDII). From there you can either have them pull the codes while you are already there or you can purchase a code reader from the store or online. (make sure that the code reader you get is one that matches the type of OBD that is in your car. The closest thing I think of that would help you is you can now get an OBD scanner that connects to your smartphone via Bluetooth. You will have to download an app in order for the scanner to work. It plugs into the port on your car and it will talk to the app through Bluetooth.