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Check engine alarm on 2021 Wakesetter LSV


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Any suggestions on this check engine code: 4239 Adaptive Learn Low Bank 2

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Fault occurs when the bank2 (port) exhaust air fuel sensor reads too rich.  Low system voltage, loose ground on the engine block stud, or a faulty sensor are the most common causes.  High fuel pressure or a leaking fuel injector are other possible causes.  I have seen a couple times where an ECM calibration update has corrected the issue. 

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