Is the check engine light coming on when the ignition is switched on?
Do you have access to a code reader?
Have you checked to see what, if any codes are set?
The traditional troubleshooting methods are still applicable - do you have air, fuel & fire - and no, being able to smell gas does not count, that gas may not be where it needs to be - in the cylinder.
The 2.0 engines have been known to have cam position sensor issues - BUT - the sensors are more likely to fail when hot and work again after they cool down, rather than a sudden outright failure.
I'm not certain if you can see the cam through the oil filler - take a peep, and if you can, have someone crank the engine whilst you observe - does the cam turn?