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B0170 B0xxx · 车身（B） 低严重度
Evaporator Temperature Sensor Circuit
The evaporator temperature sensor reading is implausible. The A/C compressor then cannot be modulated correctly, risking evaporator icing.
严重程度说明： 低——通常不影响行驶，下次保养时处理即可
你会注意到的故障现象
- A/C cuts out intermittently
- Weak cooling
- Evaporator icing and reduced airflow
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 Corroded connector at the HVAC housing
- 3 Wiring damage
- 4 Sensor dislodged from the evaporator
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。
- ✓ Watch evaporator temperature in live data — it should stabilise just above freezing.
- ✓ Inspect the sensor and its position on the evaporator core.
- ✓ Check the connector at the HVAC housing for corrosion.
维修方案
- Replace the evaporator temperature sensor
- Re-seat the sensor correctly
- Repair the wiring
B0170 —— 常见问题
Why does the airflow drop after 20 minutes? +
Classic evaporator icing from a sensor that reads too warm, so the compressor never backs off.
Can I keep using the A/C? +
Short term yes, but icing and compressor cycling will eventually damage the system.