Please this car is working as if the plugs are bad, please help it is urgent.

The only way for a Mercedes-Benz to have water in the cylinders from washing the car engine is you must have had the engine running while simultaneously squirting the water into the air intake. If that is indeed the case, congratulations, there's no need to look up the codes because you have succeeded in getting water into the engine, your rods are bent and now you need a new engine.