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P0430 P0xxx · 동력계 (P) 심각도 중간
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.
심각도 안내: 중간 — 주행성 또는 배출가스에 영향, 이번 주 안에 점검하세요
확인할 수 있는 증상
- Failed emissions test
- Slight loss of power
- Sulphur smell
- No obvious drivability change in mild cases
주요 원인
가능성이 높은 순서로 정렬되어 있습니다. 위부터 확인하세요.
- 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
점검 방법
비용이 적고 침습적이지 않은 항목부터 — 대부분의 코드는 부품 문제가 아닙니다.
- ✓ 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.
수리 방법
- Replace the catalytic converter
- Repair the exhaust leak
- Fix the upstream rich/misfire fault first
P0430 — 자주 묻는 질문
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.