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Oil temp reading "---" or 0 and oil cooling fan on

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Oil temp reading "---" or 0 and oil cooling fan on

 
Old 02-11-2019, 01:58 PM
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Oil temp reading "---" or 0 and oil cooling fan on

Anyone experience this issue? My oil temp sensor read 0 today and oil cooling fan ran for about 2 minutes after parking. Oil in engine not an issue. Can we confirm the fan was on because of a fail safe and not anything else other than a failed sensor. Its been a real weird sensor....oil temp readings were all over the place and never seemed to get to operating temp. Ive read through forums and the story never completes so not sure what the final fix was for other folks. Hoping just the sensor and fan was a failsafe measure. Thanks for any input.
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Old 02-11-2019, 02:14 PM
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Try cleaning the temp sensor connector. The fan on is normal when it doesn't know the temp reading.

https://mbworld.org/forums/c63-amg-w...ing-crazy.html
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Old 02-11-2019, 02:55 PM
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I had a similar issue in my 07 E63, the oil temp sensors temperature was fluctuating over the place, so I ordered a new one. Once it arrived, I took my car into to Benz elite Automotive in Fairfax, VA to have them diagnose via Star Diagnostics. They ended up changing out the oil temp sensor which isn't easy to get at on a M156 engine, as it resides behind the AC compressor. The sensor was replaced, and they took the car for a test drive, when they returned the primary oil cooler fan was on, and the oil temp showed 215 degrees, which we know wasn't right. So we again replaced that sensor we a new one, then had the sensor reset via Star.
Now my oil temperature ran at about 81 degrees Celsius before the swap, now it run about 87 degrees Celsius which equates to 187 degrees Fahrenheit. And I haven't had any further issues.
So my suggestion, would be to have someone diagnose it with Star Diagnostics. And replace the oil temp sensor, which isn't easy to access or cheap to repair, as it's the labor that gets you.
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Old 02-11-2019, 03:21 PM
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Ok thanks
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Old 02-11-2019, 03:22 PM
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Ok got it....yes working on that today...I was more concerned that the fan stayed on....sensor has been ordered.
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Old 02-12-2019, 12:50 PM
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Originally Posted by SROC276 View Post
Ok got it....yes working on that today...I was more concerned that the fan stayed on....sensor has been ordered.
The fan isn't the issue, its the sensor sending back mis-information to the ECU which is telling the fan that your oil is too dam hot, so turn on the fan to cool it down.
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