How to fix a P219A engine code: Bank 1 Air/Fuel Ratio Imbalance
Bank-1 side of the engine has the wrong air/fuel ratio. A P219A Code can be difficult to troubleshoot since many different things can cause it. If you are getting other codes, they can help point to the issue.
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Possible Causes of a P219A Code
Bad O2 Sensor
Purge Valve Stuck Open
Bad Fuel injector on Bank-1
Fuel Pressure
Dirty or Bad Mass Airflow Sensor
Vacuum Leak
Exhaust Leak
Bad PCV (Positive crankcase ventilation)
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