The most common cause of power steering system failure is hydraulic oil leakage due to aging and damage of the power steering pump or steering gear seals, which usually manifests as heavy steering, abnormal noise, or oil leakage. Specifically, damage to the oil seal at the drive shaft end of the power steering pump will cause hydraulic oil to flow into the engine oil pan, while failure of the sealing rings at positions such as the upper cover and side end cover of the steering gear will result in direct oil leakage. If one-sided heavy steering occurs, it may be due to poor sealing of the one-sided limit valve; if both sides are heavy, mechanical components such as insufficient lubrication and wear of the steering knuckle kingpin or scratching of the vane chamber wall of the power steering pump should be investigated. Unstable power supply from the generator or loose wires may also trigger the steering wheel warning light to come on, requiring comprehensive diagnosis. In daily maintenance, avoid turning the steering wheel to the extreme for a long time, and replace the power steering oil every 2 years or 40,000 kilometres to prevent such failures.
