What's the reason for the steering wheel suddenly becoming hard to turn?

[McChristopher]

Steering wheel suddenly becoming hard to turn reasons are as follows: Power steering pump failure: When the pump pressure of the power steering pump fails to meet the standard value, the steering wheel will feel heavy during use. It's necessary to inspect the flow control valve. During vehicle operation, if there's leakage in the flow control valve or safety valve, it can be repaired by grinding method, then check whether the spring of the safety valve is ineffective; replace the power steering pump. Steering gear failure: When the hydraulic pressure of the steering gear is low, the steering will feel heavy. If the steering wheel becomes heavy due to steering engine oil pressure, it needs to be repaired by professional manufacturers. Car owners are not advised to handle it themselves. Lack of oil or air in the power steering system: When there is air in the car's steering system, not only will the steering feel heavy, but there may also be noise during steering, which needs immediate attention to prevent greater losses; it's necessary to bleed the air or add oil.