Girish Kumar

Hello, my Toyota Corolla le 2009 , had the check engine and vsc light flashing and some times it went off prompting me &mechanic to think its a gas cap issue. But mechanic replaced with generic one instead of oem despite telling so. Now those flight flashes again. Closed the gap cap multiple times yesterday , lights were there. Today I see that those are not there and I drove 3 miles to test. Lights did not come on. What could be the issue?