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P0171 Land-rover - running lean

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I have the check engine light on and the cause is this P0171 (system too lean, bank 1).  Upon putting an ODBII reader to my vehicle, I have a pending code of P0154 (O2 sensor circuit, no activity bank 2, sensor 1).

my question is, can the P1054 cause the P0171 code or vice versa?
Vehicle: 1999 Land Rover Range Rover 4.6 HSE

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