What Causes the Engine Fault Light to Illuminate When the Car's Air Conditioner is On?

[StKiara]

When the car's air conditioner is on, the engine fault light may illuminate due to unclean engine cylinders or poor fuel quality. The detailed analysis is as follows: 1. Unclean engine cylinders: Dirt inside the engine can alter the engine's design parameters, leading to unstable properties and heat accumulation. This accumulated heat can cause irregular ignition, resulting in engine knocking. In such cases, the engine fault light will illuminate. 2. Poor fuel quality: The engine has specific requirements for fuel quality, especially as regulations impose higher demands on engine performance. If the fuel provided does not meet the specifications required for high-performance engines, the engine fault light may frequently illuminate.