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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> P219A - Bank 1 Air/Fuel Ratio Imbalance

P219A - Bank 1 Air/Fuel Ratio Imbalance

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DTC DESCRIPTION P219A - BANK 1 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
  • Exhaust gas recirculation (EGR) system
  • Positive crankcase ventilation (PCV) system is leaking
  • Ignition system
  • Incorrectly seated engine oil dipstick, tube or oil fill cap
  • Base engine concerns
  • Damaged universal heated oxygen sensor bank 1, sensor 1 (HO2S11)
Diagnostic Aids:  The EGR port is restricted.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test H .
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