BMW Waste Gate Hose Caution
This bulletin applies to BMW vehicles equipped with a turbocharged engine. The proper part numbers for the vacuum hose must be used when replacing the vacuum supply hoses of as turbocharging waste gate control system.
Inside diameters are not all the same. For example, a vacuum hose that is used for the waste gate control is not the same inside diameter as the one used for the exhaust flap control. Interchanging these hoses will result in repeat repairs. Mixing hose diameters may lead to the warning light on with various boost faults stored in the DME, whistling or buzzing by the waste gate control system or uneven acceleration under full load (shuddering/bucking).