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P0133 P0xxx · パワートレーン (P) 重大度低
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.
重大度の目安： 低 — 通常は走行性への影響なし。次の定期点検時に対処してください
確認できる症状
- Slightly high fuel consumption
- Failed emissions test
- No obvious drivability complaint
主な原因
可能性の高い順に並んでいます。上から順に確認してください。
- 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
点検・修理の手順
費用が安く侵襲の小さい項目から — これらのコードの大半は部品の問題ではありません。
- ✓ 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.
修理の選択肢
- Replace the upstream oxygen sensor
- Repair the root cause of contamination first
P0133 — よくあるご質問
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.