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Old 03-01-2013, 07:31 AM   #1
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Ambient temp sensor has gone completely insane

Since I got the car a year ago, the temp sensor has been fine... accurate enough for me and I've been happy.

But last night it went nuts. The outside temp was about 40F. I noticed the cabin air getting colder, so I looked at the display. It said 108F and was climbing. It was up to about 130F or so and I shut off the car. When I started it back up, it said -40F, and started climbing again. Later that night, it said something like 156F.

So it seems very broken. Any idea where I might check to make sure it's plugged in correctly? I understand that the sensor is, I think, in the passenger mirror. Then where does the wire go?

Before I bring it back to the dealer, I figured I'd check to see if anyone else has had this issue and if there was a simple fix.

Thanks!


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Old 03-01-2013, 07:36 AM   #2
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IIRC, I saw a thread that was dealing with heated mirrors, that wire bundle goes directly to the BCM under the passenger dash...
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Old 03-01-2013, 09:15 AM   #3
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Any chance there was an invisible man holding a heating device up to the temperature sensor? Or perhaps Superman and his heat-vision?

Seriously, if it's under warranty just take it to the dealer. And next time take pics of the readout for proof, in-case it cannot be reproduced.
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Old 03-01-2013, 09:47 AM   #4
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Quote:
Originally Posted by Steve2012Focus View Post
Since I got the car a year ago, the temp sensor has been fine... accurate enough for me and I've been happy.

But last night it went nuts. The outside temp was about 40F. I noticed the cabin air getting colder, so I looked at the display. It said 108F and was climbing. It was up to about 130F or so and I shut off the car. When I started it back up, it said -40F, and started climbing again. Later that night, it said something like 156F...
Hi Steve2012Focus,

Making an appointment at your dealership is a great next step. Additionally, I'm happy to get your case escalated to your regional customer service manager. To get the ball rolling, send me a PM with your VIN, dealer, mileage, daytime phone number, and full name. I'll take it from there!

Crystal
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Old 03-01-2013, 09:51 AM   #5
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Obviously a bad sensor. You're car is too young to suffer menopause.

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Old 03-01-2013, 12:58 PM   #6
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Question : are you operating your Focus on some distant planet? This may explain the weird temperature fluctuations. Hope this helps.
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Old 03-01-2013, 01:00 PM   #7
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Global climate change. Get used to it.
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Old 03-01-2013, 01:09 PM   #8
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Punxsutawney Phil was right! A REALLY early summer.
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Old 03-01-2013, 08:37 PM   #9
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Sounds like Ohio weather! One day it's -40 the next shorts and t shirt ;)
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Old 03-01-2013, 09:29 PM   #10
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Sounds like Ohio weather! One day it's -40 the next shorts and t shirt ;)
Definitely. We have a saying up here around Cleveland, "if you don't like the weather, wait five minutes it'll change.
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