P0171 Mazda Fuel Trim System Too Lean (bank 1)

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What are the Possible Causes of the DTC P0171 Mazda.


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 Mazda 

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 Mazda 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 Mazda?

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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