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  1. Cannot get rid of Code P0128 on 2001 M5

    E39 M5 and E52 Z8 Discussion
    I cannot get rid of the Code P0128 "Coolant Thermostat Coolant temp below thermostat regulating temp". I am on my 4th mechanic. Thermostats replaced 3 times, temp sensor, water pumps (secondary pump done at the dealer) even my radiator. I had it finally at the dealer who said it was the Aux...
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