What Causes a Humming Noise When a Sedan is Running?

[LaRuby]

The following are possible reasons for a humming noise when a sedan is running: 1. Air pipe leakage or improperly installed air filter: This is usually caused by a leak in the engine's intake pipe or an improperly installed air filter, or a detached vacuum hose. During driving, this situation may occur. It is necessary to conduct an inspection to ensure the intake pipe is reliably sealed, restoring normal operation. Timely maintenance is essential to ensure stable, comfortable, and safe driving. 2. Bearing failure: Drive the car to 80KM, then shift to neutral and coast while listening carefully. If the noise becomes clearer, it can be determined that one of the four wheel bearings has a problem. If the noise disappears when coasting in neutral, it is usually due to a bearing failure in the engine. Common bearing failures in the engine include those in the water pump, generator, or tensioner pulley.