P0174 OBD II Trouble Code System Too Lean (Bank 2)

Symptoms of P0174 OBD II Trouble Code

  • lack of power
  • increased fuel consumption
  • detonation (spark knock)
  • hesitation/surge on acceleration

Common Causes of P0174 OBD II Trouble Code

  • The MAF (Mass Air Flow) Sensor is dirty or faulty (if equipped). Note: The use of "oiled" air filters can cause the MAF to become contaminated 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.
  • There could be a vacuum leak downstream of the MAF sensor
  • Fuel problem (rail/injectors/pump/regulator)