What problem might be indicated by the steering wheel becoming difficult to turn?

When the steering wheel becomes difficult to turn, one of the primary reasons could be low lubricant levels in the steering system. The steering system typically relies on fluid to operate smoothly, especially in power steering systems. Low lubricant can lead to increased friction and resistance within the steering components, making it harder for the driver to maneuver the steering wheel.

In power steering systems, for example, the loss of fluid not only impacts the hydraulic assist but can also lead to increased wear and tear on the steering gear and pump. Consequently, this can result in poor steering response and significant difficulty in turning the wheel.

While other options might relate to steering issues, they do not directly cause the same immediate and noticeable effect on steering effort as low lubricant does. High tire pressure generally impacts ride quality and grip rather than steering effort directly. A tight pitman arm would typically suggest issues with the linkage or steering gear, but it isn't commonly linked to the overall fluid dynamics that directly affect steering effort. Camber misalignment affects tire wear and handling but does not change the mechanical advantage provided by the steering system’s lubricant.