How to reset Porsche 911 Check Engine Light?
 

My customers have been working on my customers Porsche 911 recently. My customers check engine light is on. My customers want to reset it and see if it comes back on. If it does my customers will take it to the dealership ALLDATA 10.53. Is there a way to reset the engine light without taking the battery out? Like using the ignition and other buttons?
Thanks!