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Jared, ASE Certified Tech, Service Advisor
Category: Car
Satisfied Customers: 116
Experience:  ASE/MACS Certified Technician, Level 3 BMW Service Advisor, UNOH summa cum laude graduate
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BMW series5,e39.code139,Activation,map cooling.

Customer Question

BMW series5,e39.code139,Activation,map cooling.
Submitted: 8 years ago.
Category: Car
Expert:  Jared replied 8 years ago.

The thermostat in your vehicle isnt a typical type, but rather controlled by the DME, or engines computer.


That code is for a fault in the system, and more often than not requires a new thermostat to be installed




Customer: replied 8 years ago.
yhank you for that.i thaught it would be difference between the two thermostats butt i cant see that would cause misfire on cylinders 14&5 and the fact that the misfire goes away when it warms up.doesnt seem to fit
Expert:  Jared replied 8 years ago.

Nothing was posted about any misfire issues?


There is only 1 thermostat, it regulates the engines temperature by allowing coolant to pass through the radiator. More often than not, they stick in the open position, which means your vehicle will never fully get to operating temperature.


This code COULD cause some misfires if the vehicle is never entering its closed loop fuel status, but hard to say at this point. This is a condition that needs fixed first then w can further diagnose the problem

Jared and other Car Specialists are ready to help you
Customer: replied 8 years ago.
i did post all the info.buti think the first question didnt get to you. thank you for your response
Expert:  Jared replied 8 years ago.

I see now it was posted twice, first post with some more information about the misfires.


Thanks for the accept, let me know once you get a new thermostat and if the misfires still persist, do everything I can to help you out with those!