What does "low compression" in an engine indicate?

Low compression in an engine typically indicates potential engine problems. Compression refers to the pressure created within the engine's cylinders during the combustion process. Each cylinder should achieve a specific level of compression to ensure the engine runs smoothly and efficiently. When compression is low, it can suggest issues such as worn piston rings, damaged cylinder walls, leaking valves, or head gasket failures. These problems hinder the engine's ability to create the necessary pressure for efficient combustion, which can lead to poor performance, increased emissions, and reduced fuel efficiency. Therefore, recognizing low compression as a sign of possible engine issues is critical for any automotive technician.