I'm a 'beginner' in the world of cars and took something off on top the engine that had oil under it. Not entirely sure what its called, or what the gasket used is called. Pics below to help. I also found one of the bolts securing this plate was missing, and oil was coming out around it and onto plug 1, 2 and 3, plus down the back of the engine. Is the missing bolt the likely cause of the leaking oil? And could it cause the rough engine/flashing EML light i've had?