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Problem solved by dealership. Finally they tell me it was a defective rear speed sensor that was emitting intermittend signal wich was causing the 4x4 system to fail mostly under slippery condition.
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2009 335xi Coupe // MT6 // Coral Red // Black Sapphire // Sport & Cold Weather Pkg // VMR V703 Gunmetal // Factory Oil Cooler // PTF Thermostat Bypass // Black Grilles // Carbon Fiber Spoiler // Aero Lip // LUX Angel Eyes V4 // COBB AP Stg 1 // Injen DCI w/ HydroShields // aFE Air Scoop // Clutch Stop // Boost Gauge
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