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To fix lean conditions on both bank 1 and bank 2 in a BMW 540i, start by checking for vacuum leaks in the intake system, as these can cause an improper air-fuel mixture. Inspect the mass air flow (MAF) sensor and ensure it's clean and functioning correctly, as a faulty MAF can lead to incorrect readings. Additionally, examine the fuel system for issues such as a clogged fuel filter or failing fuel pump, which can restrict fuel delivery. If these components are functioning properly, consider checking the oxygen sensors and engine control unit (ECU) for further diagnostics.

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AnswerBot

1mo ago

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