P0171 Mitsubishi

P0171 Mitsubishi - System Too Lean Cylinders 1-4

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P0171 Mitsubishi Comments |  Add Comment
Possible causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
What does this mean? What does this mean?
Tech notes
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
What does this mean? What does this mean?
When is the code detected?
- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0171 Mitsubishi Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

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MITSUBISHI Technical Service Bulletins for P0171 code
2004 MITSUBISHI LANCER Fuel System, Gasoline:fuel Injection System Details
2005 MITSUBISHI LANCER Fuel System, Gasoline:fuel Injection System Details
2006 MITSUBISHI LANCER Fuel System, Gasoline:fuel Injection System Details
2004 MITSUBISHI LANCER 073000 Fuel System, Gasoline:fuel Injection System Details
2005 MITSUBISHI LANCER 073000 Fuel System, Gasoline:fuel Injection System Details
More Bulletins What does this mean? What does this mean?
Repair Shops Around Your Area
4x4 Land LLC
Chantilly, VA
(703) 263-3307
A & G Car Care
Chantilly, VA
(703) 378-2005
A & J Automotive
Centreville, VA
(703) 817-9880
See More...
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Repair Importance Level
3
1=Low 2=Medium 3=High Code Importance Level
Repair Difficulty Level
3
1=Easy 2=Moderate 3=Hard Code Importance Level
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