I’ve got a 2004 325i and the temp gauge is showing overheating so I changed out the water pump, thermostat, and coolant temp sensor. HOWEVER in the secret menu under the coolant/engine temp it shows 0121 which to my knowledge means 12.1 C. Which would be like 50F. Note that whenever I overheat it doesn’t go into limp mode and though it feels pretty hot as an engine should it doesn’t smoke or anything. Also note that my coolant is staying pretty full.
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