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Old 10-19-2010, 02:20 AM   #1
Dado 540
6th Gear Member
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Join Date: Jan 2008
Location: GTA
Posts: 1,982
CEL on...temp gauge all the way on engine temp -128C

Driving enjoying the 540i and the "check engine" light comes on. 10 minutes after i notice the temperature gauge is all the way to the right on the "red".

I pull over immediately and check the digital engine temperature read out and it says -128C (yes negative 128)

No sign of any coolant issues. No smoke. Nada.

After fiddling around and just letting it cool off, turned the car on a few times but the needle rockets to the red zone. I figure its gotta be a malfunction with the some sensor, i started her up and drove off. Check engine light remained on, however the temperature gauge went back to slightly below the half way mark while i was driving. Engine temperature digital output was 70C and increasing slowly making its way to 85. By that time i was home and the needle was on the center.

Gonna inspect the coolant level once its cool enough, even tho i did not get "low coolant level" message. Definitely gonna have to get her scanned.

Anyone with ideas of a possible culprit(s)?
E39 540i Sport

Last edited by Dado 540; 10-19-2010 at 02:27 AM.
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