P0171 Nissan Fuel Trim System Too Lean (bank 1)

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What are the Possible Causes of the DTC P0171 Nissan.

Weak or faulty fuel pump or dirty fuel filter (main culprit)

Dirty or faulty mass airflow sensor or vacuum leakages 

Defective oxygen sensor or Exhaust pipe leakages

Faulty fuel injectors

Blocked catalytic converter

How to fix code p0171 Nissan 

Clean fuel filter or replace weak the fuel pump (main culprit)

Make sure no vacuum leakages or exhaust pipe leakages blockages

Replace Mass airflow sensor 

Replace oxygen sensor 

Code p0171 Nissan Description 

A P0171 code is set by your vehicle’s power train control module (PCM) when it detects that the air-to-fuel ratio of your vehicle is too lean. 

This means that the PCM is relaying that the engine is receiving too much air into the combustion chamber and not enough fuel.

What are the Symptoms of code p0171 Nissan?

Lack of power when driving. 

Rough idle or unstable idle. 

Black smoke comes out of exhaust. 

Misfire is detected. 

Hissing sound due to vacuum leakages.

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