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Hi P0171 could be quite a few things that would trip this code.
The engine air/fuel mixture is too lean,
There is too much air or too little fuel.
- Intake or vacuum leaks
- Clogged or faulty Mass Air Flow sensor (MAF)
- Faulty PCV valve
- Stuck open purge valve/solenoid
- Failed or faulty oxygen sensor (bank 1, sensor 1)
- Improperly installed aftermarket cold intake
- Low fuel pressure
- Clogged catalytic converter
Sometimes this code can be caused by a bad MAF sensor ,might be a good idea to check this and clean it with MAF spray cleaner .
Then clear codes and test drive if the check engine light stays off then all is good if it comes back on check for codes ,still a P0171 then check the other possible causes .
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Kind regards Greg.