Engine coolant temperature, Plausibility - BMW M5 Forum and M6 Forums
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post #1 of 106 Old 1st November 2007, 08:19 PM Thread Starter
KevN23
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Engine coolant temperature, Plausibility

I have been getting this code for a while now. I reset it a few times and it always does come back on more and more often. It's the ONLY code I get and I am sure it's a 69 not b9. It would see that, after reading all the posts here, this is the coolant temperature sensor, OR the CPS. However, I haven't gotten any bad CPS codes yet so I thought I might change the temperature sensor first.

Does anyone know where on realoem can I get this? And is there an DIY on this?

Thank you all in advance.
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post #2 of 106 Old 13th November 2007, 08:54 PM Thread Starter
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Anyone??

How did you guys solve the problem? Could a (semi) bad CPS cause this also?
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post #3 of 106 Old 13th November 2007, 09:15 PM
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Could indeed be your temp sensor needs replacing. It may be sending info to the ECU that is 'implausible' based on other sensor input. If it keeps coming back, replace the sensor, clear the codes, and see if all's good again.

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post #4 of 106 Old 13th November 2007, 11:47 PM Thread Starter
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Last week the SES light actually went away from a few days before coming back on. My temperature gauge sides on the first dot, when I am cruising on the freeway around 80mph most of the time in CA weather. Is this normal?
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post #5 of 106 Old 14th November 2007, 12:33 AM
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Quote:
Originally Posted by KevN23 View Post
Last week the SES light actually went away from a few days before coming back on. My temperature gauge sides on the first dot, when I am cruising on the freeway around 80mph most of the time in CA weather. Is this normal?
Unlock the OBC. It will check oil temp and water temp in celsius. Mine sit around 80 degrees in mild outside temps.
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post #6 of 106 Old 14th November 2007, 04:42 AM
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If your coolant temp is sitting at the first dot on colder days or driving on the freeway on a cooler day while returning back to the middle in stop/go traffic, my bet would be the thermostat itself. I had the exact same issue and replacing the temp sensor didn't fix the issue. I have a new t-stat and associated parts sitting here. Anyone with a DIY for the thermostat replacement?

Steve
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post #7 of 106 Old 14th November 2007, 04:59 AM Thread Starter
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That's what my behaves like also. So looks like it's the thermostat.

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If your coolant temp is sitting at the first dot on colder days or driving on the freeway on a cooler day while returning back to the middle in stop/go traffic, my bet would be the thermostat itself. I had the exact same issue and replacing the temp sensor didn't fix the issue. I have a new t-stat and associated parts sitting here. Anyone with a DIY for the thermostat replacement?

Steve
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post #8 of 106 Old 14th November 2007, 05:08 AM
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post #9 of 106 Old 15th November 2007, 10:18 PM
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I've just had a new coolant temp sensor fitted to my beast and it comes up on the snap on scanner with the same thing.It was the double temp sensor i had replaced on the top of the water pump so i would'nt put too much faith in that being your problem as mines brand new and is still saying the same thing on the snap on code scanner!!

Last edited by sonicEVO1; 15th November 2007 at 10:19 PM.
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post #10 of 106 Old 15th November 2007, 11:23 PM
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I would suspect the thermostat also

I remember browsing through the TIS documents on how to change it. Looked like a real pain.
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