It's possible that the misfire was a temporary issue caused by the impact itself and might resolve on its own. Drive for a bit and see. Then, try to reset the code. Pay attention to how the car performs. If it drives normally and the check engine light stays off, the problem might have resolved itself.
If not...
Check the spark plugs and ignition coils. They might have become loose or damaged due to the impact.
And less likely, but also possible:
Fuel injectors or fuel lines, causing irregular fuel delivery.
Inspect for any vacuum hose that might have come loose or got damaged, leading to an imbalance in the air-fuel mixture.
Loose connection in the electrical system. Check the wiring harness and connectors for any signs of damage or looseness.
Sensors such as the MAF (Mass Air Flow) sensor, as they might have been affected by the vibration.
I think, that if it doesn't go away, start with the spark plugs and ignition coils.
