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C0220 C0xxx · 底盘（C） 高严重度
Right Rear Wheel Speed Sensor Circuit
Right rear wheel speed signal lost. ABS and stability functions disabled until all four wheels report reliably.
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
- No ABS intervention
- Possible speedometer dropout
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 Worn hub bearing
- 4 Wiring break at the flex point
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 and identify the outlier.
- ✓ Check hub play before replacing the sensor.
- ✓ Inspect the harness where it flexes with the suspension.
- ✓ Scope the signal while rotating the wheel.
维修方案
- Replace the sensor
- Replace the hub if bearing wear is present
- Repair the wiring
C0220 —— 常见问题
One wheel reads zero at a standstill — is that normal? +
Yes until you roll. Compare at walking pace; a sensor that stays at zero is faulty.
Can I fit a cheap aftermarket sensor? +
You can, but wheel speed sensors are a safety input. Use a quality part with the correct air gap.