Which of the following could indicate a problem with the fuel system?

The illuminated check engine light is a critical indicator of potential issues within the vehicle, including the fuel system. When the vehicle’s onboard diagnostics detects a malfunction, it triggers the check engine light to alert the driver. This light can be activated by various issues related to the fuel system, such as a faulty fuel injector, a leak in the fuel line, or problems with the fuel pump. Mechanics often begin their diagnostic process by reading the trouble codes associated with the illuminated check engine light, which can point them toward the fuel system as a potential source of the problem.

While steering issues and unusual vibrations can indicate other mechanical problems or system malfunctions, they do not specifically point to the fuel system. Thus, though these symptoms are relevant in diagnosing engine performance and vehicle function, they are broader in nature and may involve various systems unrelated to fuel delivery. The check engine light, on the other hand, provides a direct indication that the engine management system has identified an issue that requires further investigation, especially with the fuel system.