Possible computer error. on 2003 Mercedes-Benz E500

My car stop all of a suddent a couple of times this month and it will start with 20-30 minutes and it will show on console says "Engine Check" and next day it will clear the message> What could be the problems?

Asked by for the 2003 Mercedes-Benz E500
This sounds like a check engine light trouble code being thrown. Start with the RepairPal article on the check engine light:

You'll need a good diagnostic technician--intermittent emission control system problems can be hard to figure out.
2 more answers
probably bad camshaft sensor
It is definately the Crankshaft Position Sensor. Just had my replaced at the Stealership $280.