Hi there I got stuck in flood water in my renault scenic
The engine runs but there is a loud knocking sound from it
There also seems to be water in the oil
HELP
Marion

Immediately change the engine oil and filter. I would remove the spark plugs and ensure there's not any water inside the cylinders. This would be a good time to change the spark plugs. Remove the distributor cap, if any, and dry it out. If you have coil-on-plugs, remove them from the spark plug tubes and dry everything out. Water gets into the spark plug tube, where engine heat converts it to steam, and damages the coil.

The link below may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563-7.html#post845783