Under normal circumstances, water is unlikely to enter a car engine through the exhaust pipe. The exhaust system is designed to expel combustion byproducts, including water vapor, from the engine. However, there are certain situations where water can potentially enter the engine through the exhaust, although it is relatively rare.
If a car is exposed to deep water, such as when driving through a flooded area or during heavy rainfall, there is a possibility that water can enter the exhaust system and reach the engine. This can happen if the water level is high enough to submerge the tailpipe or if the car's exhaust system has a low exit point that allows water to be drawn into the engine. In such cases, the water can cause significant damage to the engine, potentially leading to hydrostatic lock, where the water prevents the engine from turning over.
To avoid this, it is important to exercise caution when driving through flooded areas and avoid immersing the tailpipe in water. If you suspect that water has entered the engine, it is best to have the car inspected by a professional mechanic to assess any potential damage and take appropriate measures.
It's worth noting that modern cars often have protective measures, such as raised tailpipes or check valves, to minimize the risk of water entering the engine through the exhaust. Nonetheless, it is still important to exercise caution in situations where the possibility of water ingestion exists.