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P0133 P0xxx · 动力总成（P） 低严重度
O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
The sensor still switches, but too slowly to control mixture properly. A classic ageing symptom — the sensor is tired, not dead.
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
- Slightly high fuel consumption
- Failed emissions test
- No obvious drivability complaint
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Ageing or contaminated oxygen sensor
- 2 Silicate poisoning from coolant or sealant
- 3 Carbon fouling from rich running
- 4 Exhaust leak near the sensor
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。
- ✓ Measure switch frequency in live data; below roughly 0.5 Hz at 2,500 rpm is too slow.
- ✓ Inspect for contamination: white/grey deposits mean coolant, black soot means rich running.
- ✓ Fix any underlying rich fault before fitting the new sensor.
维修方案
- Replace the upstream oxygen sensor
- Repair the root cause of contamination first
P0133 —— 常见问题
How long do O2 sensors last? +
Typically 100,000–160,000 km. Slow response is the usual first sign of ageing.
Do I need the OEM part? +
For the upstream sensor, yes — cheap universals often switch too slowly and set this code again.