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P0430 P0xxx · パワートレーン (P) 重大度中
Catalyst System Efficiency Below Threshold (Bank 2)
The bank 2 catalytic converter is no longer storing enough oxygen to smooth the exhaust — the downstream sensor is switching too much like the upstream one.
重大度の目安： 中 — 走行性または排出ガスに影響。今週中に点検を予約してください
確認できる症状
- Failed emissions test
- Slight loss of power
- Sulphur smell
- No obvious drivability change in mild cases
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 overheated catalyst
- 2 Exhaust leak between the two sensors
- 3 Downstream O2 sensor lazy or biased
- 4 Engine running rich or misfiring for a long period upstream
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。
- ✓ Rule out an exhaust leak first — it is free to check and a common false cause.
- ✓ Compare upstream and downstream sensor waveforms; a healthy downstream signal is nearly flat.
- ✓ Check fuel trims and misfire counters — fix the cause before condemning the catalyst.
- ✓ Measure back-pressure to rule out a physically blocked converter.
修理の選択肢
- Replace the catalytic converter
- Repair the exhaust leak
- Fix the upstream rich/misfire fault first
P0430 — よくあるご質問
Is the converter definitely dead? +
Not always. Fixing an exhaust leak or a rich-running fault clears maybe one in four of these codes.
Can I use a universal converter? +
You can, but on OBD-II-monitored vehicles a correctly specified converter avoids comebacks.