I was passing a line of vehicles when a semi started over into my lane. I hit the gas, to avoid being hit by the truck. When I did warning light on my vehicle appeared on the display. I lost speed and immediately heard a loud knocking from the engine. I was on an open 4 lane highway and knew there was a dealer close by. I drove to the dealership, I left the vehicle running so they could hear it. The service tech told me they had seen