P0171 — System Too Lean (Bank 1)

Powertrain (motor/växellåda)

P0171 signifies that the fuel trim system is operating too lean on Bank 1. This means the engine control module (ECM) is detecting too much air or not enough fuel in the exhaust gases for the specified engine load.

The powertrain control module (PCM)/ECM monitors the air-fuel mixture feedback from the oxygen sensors to ensure the engine operates within optimal parameters for fuel efficiency and emissions control.

Read in English

Kan jag köra med P0171?

Du kan oftast köra hem och boka en kontroll inom några dagar.

Vanliga orsaker

• Vacuum leak in the intake system (e.g., vacuum hoses, intake manifold gasket)
• Faulty Mass Airflow (MAF) sensor (reporting inaccurate air intake to the ECM)
• Clogged or failing fuel injector(s) on Bank 1 or a weak fuel pump/pressure regulator

Vanliga symptom vid P0171

• Engine runs rough
• Engine stalls
• Hard to start

Full symptommatchning, sannolikhetsscoring och relaterade koder för din specifika bil kräver diagnos.

Vanliga frågor

Vad betyder felkoden P0171?

P0171 means System Too Lean (Bank 1).

Kan jag fortsätta köra med P0171?

Du kan oftast köra hem och boka en kontroll inom några dagar.

Vilka symptom är vanliga vid P0171?

Engine runs rough, Engine stalls, Hard to start

Relaterade felkoder

• P0170 — Fuel Trim Malfunction (Bank 1)
• P0172 — System Too Rich (Bank 1)
• P0173 — Fuel Trim Malfunction (Bank 2)
• P0174 — System Too Lean (Bank 2)
• P0175 — System Too Rich (Bank 2)

Få en full diagnos av P0171 med AutoUncover.