LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Infiniti
>>
2023
>>
QX55 Essential
>>
Repair and Diagnosis (Single Page)
>>
Engine Performance
>>
System
>>
Engine Control System (DTC/Circuit Diagnosis) (2 Of 5)
>>
DTC/Circuit Diagnosis
>>
DTC P0171: Fuel Injection System Function
>>
DTC Description
>>
Possible Cause
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Possible Cause
Intake air leakage
A/F sensor 1
Direct fuel injector
Exhaust gas leakage
Incorrect fuel pressure
Lack of fuel
Mass air flow sensor
Incorrect PCV hose connection