P219B - Bank 2 Air-Fuel Ratio Imbalance

2021 Ford Edge SE, 4WDSECTION P219B - Bank 2 Air-Fuel Ratio Imbalance
DTC DESCRIPTION P219B - BANK 2 AIR-FUEL RATIO IMBALANCE

Description:  The air to fuel imbalance monitor is designed to detect large differences in the air to fuel ratio between cylinders per engine bank. This DTC sets when the air to fuel ratio difference per cylinder is greater than a calculated amount.
Possible Causes: 
  • Leaking or contaminated fuel injectors
  • Low fuel pressure or running out of fuel
  • Leaking EVAP purge valve
  • Exhaust or intake air system leaks
  • Positive crankcase ventilation (PCV) system is leaking
  • Ignition system
  • Incorrectly seated engine oil level indicator, tube or oil fill cap
  • Base engine concerns
  • Damaged universal heated oxygen sensor bank 2, sensor 1 (HO2S21)
Diagnostic Aids:   
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test H.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.