Engine Temp not longer gets to the middle of the dial (Pic) - BMW M5 Forum and M6 Forums
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post #1 of 19 Old 6th September 2013, 04:17 PM Thread Starter
m5racer111
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Engine Temp not longer gets to the middle of the dial (Pic)

Hey everyone,

So a few weeks back I noticed that my engine temp no long got to the middle of the dial once the car was warmed up. Now the gauge needle only gets off the blue (cold side and just barley gets over the dotted line. Does this mean I kneed a new thermostat or engine temp sensor?

I got Code 105- Plausibility engine temperature the other day if that helps


Last edited by m5racer111; 6th September 2013 at 04:47 PM.
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post #2 of 19 Old 6th September 2013, 04:38 PM
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My money is on the Thermostat. I had the same symptoms 2 weeks ago. Replaced the Tstat and all is better now. A very common failure point for the E39. Quite a few DIYs to help with the job.

Last edited by HCrawford; 6th September 2013 at 04:39 PM.
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post #3 of 19 Old 6th September 2013, 04:42 PM
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Quote:
Originally Posted by m5racer111 View Post
Hey everyone,

So a few weeks back I noticed that my engine temp no long got to the middle of the dial once the car was warmed up. Now the gauge needle only gets off the blue (cold side and just barley gets over the dotted line. Does this mean I kneed a new thermostat or engine temp sensor? I scanned the car and will post up the code that was there once its emailed to me from my friend.

Do you know if the code that registered was P0128 (Coolant Below threshold (or something to that affect)). If this is the case most likely it is time for a new T'stat.

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post #4 of 19 Old 6th September 2013, 04:48 PM Thread Starter
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post #5 of 19 Old 6th September 2013, 04:48 PM
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Quote:
Originally Posted by m5racer111 View Post
Hey everyone,

So a few weeks back I noticed that my engine temp no long got to the middle of the dial once the car was warmed up. Now the gauge needle only gets off the blue (cold side and just barley gets over the dotted line. Does this mean I kneed a new thermostat or engine temp sensor? I scanned the car and will post up the code that was there once its emailed to me from my friend.

99% chance new thermostat needed. Go to secret menu and confirm actual temps. #7 water temp, #16 oil temp.

I believe Peake reads a "69" code (could be b9, don't remember).

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post #6 of 19 Old 6th September 2013, 04:48 PM Thread Starter
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The only code I had I posted at the top right after your post

105- Plausibility engine temperature

Last edited by m5racer111; 6th September 2013 at 04:49 PM.
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post #7 of 19 Old 6th September 2013, 05:41 PM
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Check secret menu, anything less than 79c and it's new thermostat time.
I've gotten through two in four years. Get lots of spare associated rubber o rings that seal the three little pipes that go to and from the t-stat. if they pinch and tear in the process, coolant will be lost and you'l have to do it again.
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post #8 of 19 Old 6th September 2013, 10:11 PM
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post #9 of 19 Old 7th September 2013, 12:00 AM
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Why does this happen on some cars that have no thermostat issues?

The two cars I went to see and the one I bought were all like this. My thermostat works without issue.
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post #10 of 19 Old 7th September 2013, 01:47 AM
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Quote:
Originally Posted by DirtyHarry View Post
Why does this happen on some cars that have no thermostat issues?

The two cars I went to see and the one I bought were all like this. My thermostat works without issue.
Are you certain that your thermostat is working without issue? I had a non-functioning thermostat for about a year before I realized it was an issue. The car ran fine and the heat worked etc., but I kept getting that vague error code #69 "Engine Coolant Temp Plausibility" more and more frequently. ALSO, I constantly had an amazing buildup of black soot on the back of the trunk and bumper. I could write my name in it after just 50 miles or so. Now that I put in a new t-stat and the car is reaching its design temp. that buildup is no more.
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