OBD-II / EOBD Diagnostic Trouble Code Database • Code P0171

OBD-II Fault Code P0171: System Too Lean (Bank 1 – Air/Fuel Mixture Too Lean)

Q: What does OBD-II fault code P0171 (System Too Lean (Bank 1 – Air/Fuel Mixture Too Lean)) a jaké má příznaky?

OBD-II Fault Code P0171 označuje: System Too Lean (Bank 1 – Air/Fuel Mixture Too Lean). Nejčastější projevy: Rough or fluctuating idle, loss of power, occasional engine stalling, illuminated Check Engine light.

Q: Jaké jsou nejčastější příčiny a oprava chyby P0171?

Nejčastější příčiny chybového kódu P0171 seřazené podle pravděpodobnosti: 1. Vacuum / unmetered air leak downstream of the MAF sensor (cracked PCV breather hose or intake manifold gasket) • 2. Dirty or faulty Mass Air Flow (MAF) sensor • 3. Low fuel pressure (weak fuel pump or clogged fuel filter) • 4. Poorly calibrated LPG system.

⚠️ Common Symptoms & Driving Behavior

Rough or fluctuating idle, loss of power, occasional engine stalling, illuminated Check Engine light.

🔧 Most Common Causes & Repair Guide (P0171)

1. Vacuum / unmetered air leak downstream of the MAF sensor (cracked PCV breather hose or intake manifold gasket) • 2. Dirty or faulty Mass Air Flow (MAF) sensor • 3. Low fuel pressure (weak fuel pump or clogged fuel filter) • 4. Poorly calibrated LPG system.