DTC P0128, BMW Hex Code 0x1D2008, BMW Code 1908744: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature): Subcomponent

WARNING: This page does not describe the selected car, but rather 52 other vehicles, including the 2013 BMW X6 M, 2013 BMW X5 M, 2013 BMW M6, 2013 BMW M5, and 2013 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.