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Do you get the lean code at idle / cruising ? If so it's almost certainly vacuum leak or air is being ducked somewhere pos maf.
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F10 535i LCI, Hybrid Turbo, Custom Inlet, Spool FX-150 Pump HPFP, TI Automotive LPFP, DV+, Phoenix IC, FTP CP, High Flow Cat, M5 Mufflers, Custom Tuned By David Shoup.
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