if you're still having the problem this is what the FSM says
Intake air leaks
• A/F sensor 1
• Fuel injector
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Mass air flow sensor
• Incorrect PCV hose connection
also P0171 is the passenger side bank only not both banks, driver's side is p0174 the ecu takes two trips to throw the light and 3 trips with identical driving conditions to shut off the light by itself if the problem stops.
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