Hit deer with 2016 Hyundai Sonata. Took out front grill, bent radiator a bit, and a bit more body damage. Had an engine code get set. Scanned it and it was P0326 Engine Knock Sensor Bank 1. Noticed a little bit of knocking sound upon acceleration, but seems to subside when backing off on the accelerator. What could be causing this knocking? Did not knock before hitting the deer. Don't notice any fluid loss except there is a pin hole in the upper part of radiator.