Why is my power steering stiff?

A heavy steering wheel is usually caused by mechanical or hydraulic system issues. Common causes include insufficient or degraded power steering fluid, low tyre pressure, and malfunctions in the steering gear or power steering pump. As the medium for transmitting steering force, inadequate or contaminated power steering fluid directly impairs steering assistance performance; It is best to inspect or replace the fluid every 2 to 3 years. Low tyre pressure increases friction between the tyres and the road surface, resulting in greater steering resistance. Excessively tight steering gear bearing clearance, a worn or broken power steering pump belt, or a blown electric power steering fuse can also lead to heavy steering, necessitating prompt inspection and component replacement. It is advisable to check alignment data and clean the hydraulic system every 20,000 kilometres. If the issue persists, potential faults such as steering column binding, suspension deformation, or sensor calibration errors should be investigated. For vehicles with electric power steering, switching driving modes (e.g., from sport to economy mode) may help reduce steering effort. To minimize hydraulic system strain, avoid prolonged full-lock steering manoeuvres, particularly during low-speed turns.