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P219A - Bank 1 Air/Fuel Ratio Imbalance

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P219A - BANK 1 AIR/FUEL RATIO IMBALANCE

Description:  The air to fuel imbalance monitor is designed to detect 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
Diagnostic Aids:  One or more EGR passages may be blocked or partially blocked.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST H: FUEL CONTROL .
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