I have Hyundai i30 2008, i have changed crankshaft sensor 1 week ago. two days ago i start hearing some noise from motor while in idle and also while moving. Today the check engine light turned on and the oil light flashes only when i'm pressing gas, if i don't press gas its off. even if i press gas while im in "N" gear it turn on. I also noticed that the fuel consumption of the car is becoming bad. any idea what might be the issue?
Note: I have checked the engine oil its less than full, i added more oil but still same issue.