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C0050 C0xxx · 底盘（C） 高严重度
Left Rear Wheel Speed Sensor Circuit
Left rear wheel speed signal lost. On rear sensors, also check for hub bearing wear changing the air gap.
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 lamp on
- Handbrake or ESP lamp on some vehicles
- ABS inactive
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 Worn hub bearing altering the sensor gap
- 3 Wiring damage
- 4 Corroded tone ring
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。
- ✓ Compare live wheel speeds.
- ✓ Check hub play — excessive movement points to bearing wear, not the sensor.
- ✓ Inspect the connector near the trailing arm.
- ✓ Scope the output while rotating the wheel.
维修方案
- Replace the sensor
- Replace the hub assembly if bearing play exists
- Repair the wiring
C0050 —— 常见问题
Why did it fail right after a wheel bearing job? +
The sensor or tone ring was usually damaged during fitting, or installed on the wrong side.
Can I clean the tone ring? +
Light cleaning is fine, but a cracked or heavily rusted ring must be replaced.