本页暂无Chinese版本，以下为英文原文。 查看英文版 →
C0040 C0xxx · 底盘（C） 高严重度
Right Front Wheel Speed Sensor Circuit
Right front wheel speed signal lost or implausible. ABS, traction and stability functions are disabled.
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
- ABS and ESP lamps on
- No ABS intervention
- Possible speedometer fault
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed sensor
- 2 Damaged tone ring
- 3 Wiring damage near the strut
- 4 Corroded connector
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。
- ✓ Read all four wheel speeds and find the outlier.
- ✓ Inspect the connector and the first 30 cm of wiring — this is where breaks hide.
- ✓ Check the tone ring through the sensor bore.
- ✓ Swap-test across left and right if the fault is intermittent.
维修方案
- Replace the sensor
- Repair the wiring
- Replace the hub with a damaged tone ring
C0040 —— 常见问题
Can rust cause it? +
Yes. A rusting tone ring lifts and changes the air gap, and debris on a magnetic ring corrupts the signal.
Do I need to code a new sensor? +
Usually not for ABS sensors, but some manufacturers require a steering-angle or TPMS relearn afterwards.