I went to carwash today, and after car came out "service engine light" was on. Car was running good, i didn't notice anything. So later on, I’ve e stopped by at few places, restarting the car several times in an hour. And last time i did, the service engine light disappeared. How is that possible?

 

Most likely water got in the cylinders and affected the readings of the sensors. I don't think there's anything to worry about.

 

How could water get in inside an engine block, is there anything that should be done to prevent this in future?

Thanks!