이 페이지는 아직 Korean로 제공되지 않습니다. 영어 원문을 표시합니다. 영문으로 보기 →
P0172 P0xxx · 동력계 (P) 심각도 중간
System Too Rich (Bank 1)
Fuel trims have gone strongly negative — the ECU is pulling fuel to compensate for too much of it. The engine is running rich, not lean.
심각도 안내: 중간 — 주행성 또는 배출가스에 영향, 이번 주 안에 점검하세요
확인할 수 있는 증상
- Black smoke
- Sulphur smell
- Poor fuel economy
- Fouled spark plugs
- Catalyst overheating
주요 원인
가능성이 높은 순서로 정렬되어 있습니다. 위부터 확인하세요.
- 1 Leaking or dripping injector
- 2 Excessively high fuel pressure (stuck pressure regulator or failing pump control)
- 3 Contaminated MAF reading high
- 4 Purge valve stuck open flooding the intake with fuel vapour
- 5 Restricted air filter or intake
점검 방법
비용이 적고 침습적이지 않은 항목부터 — 대부분의 코드는 부품 문제가 아닙니다.
- ✓ Read short-term and long-term fuel trim: strongly negative means the ECU is removing fuel.
- ✓ Check fuel pressure against specification and watch for pressure dropping after shut-down (leaking injector).
- ✓ Inspect the EVAP purge valve for a stuck-open condition.
- ✓ Compare MAF reading with calculated load.
- ✓ Smoke-test the intake only after ruling out the fuel side.
수리 방법
- Clean or replace injectors
- Repair the fuel pressure fault
- Replace the EVAP purge valve
- Replace the MAF if it over-reads
P0172 — 자주 묻는 질문
Is rich or lean worse for the engine? +
Rich washes oil off cylinder walls and overheats the catalyst; lean causes knock and burnt valves. Both need fixing, rich is usually cheaper.
Why is the code bank-specific? +
Bank 1 is the side containing cylinder 1. A single-sided fault points to injectors, an exhaust leak or an O2 sensor on that bank.