Fuel mixture is too lean. Could be anything from a vacuum leak, dirty MAF sensor, bad O2 sensor, etc...
code po171
Code P0171 means System to lean (bank 1)
po171--- system to lean (bank # 1)
P0171 System too Lean (Bank 1)
Trouble code P0171 means:System too lean (bank 1)
P0171 = System too lean (Bank 1) Look for a vacuum leak before you buy any parts.
Trouble code P1507 means: Idle air control (IAC) underspeed error
burn the car
Trouble code P0171 Means: System too lean (bank 1)
Bank 1 system to lean. I would suspect a vacuum leak. Check under the hood for a disconnected or cracked vacuum line.
Trouble code P0715 means: Input/turbine speed sensor circuit malfunction
first try cleaning your mass air flow sensor.