What we can do for auto error code P0171 ?
You can try to do these below : 1.The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. 2.There could be a vacuum leak downstream of the MAF sensor 3.Possible cracked vacuum or PCV line/connection 4.Faulty or stuck open PCV valve 5.Failed or faulty oxygen sensor (bank 1, sensor 1) 6.Sticking/plugged or failed fuel injector 7.Low fuel pressure (possible plugged/dirty fuel filter!) 8.Exhaust leak between engine and first oxygen sensor. Of course, this is not completed list. You can add your versions in comments. Learn more: https://www.obd-codes.com/p0171 Want to look video ?