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Old 01-22-2013, 06:19 PM   #26
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 16,576
My Ride: 330CiC, M5, X5
Does not matter how old the thermostat is, you need to check and verify the engine coolant temperature.

The only way you can accurately condemn a weak thermostat is during the colder Winter months.
Solve your misfires, lean codes, rough idle -

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Temp Info -

Hidden OBC Menu - Check Voltage, Temp, Fuel Level -

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Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 01-22-2013 at 06:19 PM.
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