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C0230 C0xxx · 底盘（C） 高严重度
Brake Booster / Vacuum or Electric Assist Sensor Fault
The brake assist system cannot verify booster performance. Pedal effort may increase and braking distances can lengthen.
严重程度说明： 高——立即停车诊断，继续行驶有扩大损坏的风险
你会注意到的故障现象
- Hard brake pedal
- Longer stopping distance
- Brake warning lamp
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed boost pressure sensor
- 2 Vacuum leak to the booster
- 3 Faulty electric vacuum pump
- 4 Wiring fault
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Check pedal feel first — a genuinely hard pedal means assist is lost.
- ✓ Inspect vacuum hoses and the one-way valve.
- ✓ Test the electric vacuum pump where fitted.
- ✓ Read live boost pressure and compare with specification.
维修方案
- Replace the vacuum hose or one-way valve
- Replace the vacuum pump
- Replace the boost sensor
C0230 —— 常见问题
Is it safe to drive? +
If the pedal is hard, braking distance increases significantly. Have it recovered rather than driven.
Why is it worse on a cold start? +
A leaking one-way valve or weak pump shows up before manifold vacuum stabilises.