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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Wed, May-10-2017, 10:23:29 PM   #1
Momo157
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Default Ambient (exterior) Temp sensor

So, when I bought my car a few months back, the ambient temp sensor had been ripped from the wires and nothing was there. I purchased a repair kit from ESC Tuning in hopes of it being a quick repair. I digress, it doesn't seem to be that easy. Its still reading -35F and I can't seem to figure out the problem...maybe the wire is broken further back than I replaced? Or the sensor is bad? Is it possible to wire it up wrong? I did notice the temperature will gradually climb (Usually around 70F-80F) and then drop back down in temp. It doesn't alway return to -35F. However it consistently drops between +37F and -35F.....any input is welcome and appreciated.





Here's a link to the kit:
https://www.ecstuning.com/b-assemble...65816905133kt/

Last edited by Momo157; Wed, May-10-2017 at 10:26:39 PM.
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Old Thu, May-11-2017, 01:13:35 AM   #2
Braymond141
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Default Re: Ambient (exterior) Temp sensor

What side did you install this on? Driver or passenger?
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Old Thu, May-11-2017, 11:25:52 AM   #3
M_Parallel
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Default Re: Ambient (exterior) Temp sensor

I've seen this happen before. It could take a little time before it shows the right temp. Shouldn't take days or anything, but it's not uncommon either for it not to show the temp right away.

You could also reset the OBC and see if that helps. You need to access the 'hidden' menu to do this.
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Old Fri, May-12-2017, 01:12:57 AM   #4
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Default Re: Ambient (exterior) Temp sensor

Should be plug and play. Trace the wiring as far as you can and make sure it is intact.

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Old Fri, May-12-2017, 03:59:50 PM   #5
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Default Re: Ambient (exterior) Temp sensor

Make sure all your wire connections are solid and as Hallatauer said to trace the stock wires looking for pinches/frays. It should be a plug and done repair.

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Old Fri, May-12-2017, 04:29:05 PM   #6
Braymond141
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Default Re: Ambient (exterior) Temp sensor

Again... what side was the kit installed on. Too many people confuse the passenger side heated nozzle/door lock temp sensor for the OBC outside temp sensor located in the driver brake duct.
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Old Fri, May-12-2017, 04:31:26 PM   #7
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Default Re: Ambient (exterior) Temp sensor

Also the kit linked is not specifically listed for the E36. The E36 sensor also differs in design and likely functionality.
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Old Fri, May-12-2017, 04:41:00 PM   #8
M_Parallel
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Default Re: Ambient (exterior) Temp sensor

Quote:
Originally Posted by Braymond141 View Post
Again... what side was the kit installed on. Too many people confuse the passenger side heated nozzle/door lock temp sensor for the OBC outside temp sensor located in the driver brake duct.
Amazing.

It just take 5 minutes for finding out which side is what.
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Old Fri, May-12-2017, 07:34:32 PM   #9
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Default Re: Ambient (exterior) Temp sensor

Quote:
Originally Posted by M_Parallel View Post
Amazing.

It just take 5 minutes for finding out which side is what.
No shit, but did he look?

Last edited by Braymond141; Sat, May-13-2017 at 05:10:17 PM.
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Old Fri, May-12-2017, 11:19:13 PM   #10
Momo157
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Default Re: Ambient (exterior) Temp sensor

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Originally Posted by Braymond141 View Post
Again... what side was the kit installed on. Too many people confuse the passenger side heated nozzle/door lock temp sensor for the OBC outside temp sensor located in the driver brake duct.
I put it on the passenger side, because the previous owner informed me that's where it went. I took his word for it and just went with it. What color wires should I be looking for? Something happened and he didn't have all the duct work under the car so I didn't have a reference as to where it went, he just pointed out two wires and told me that's where I should wire up the new one. What does the other sensor do?

Last edited by Momo157; Fri, May-12-2017 at 11:26:41 PM.
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Discussing Ambient (exterior) Temp sensor in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)