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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 12-22-2014, 06:54 PM
Registered User
Location: California
Join Date: Dec 2014
Posts: 1
Mein Auto: 2000 E46 (328i)
-40 Temperature Reading

I was driving home on the freeway the other day, and my car beeped and told me that the temperature was -40. I live in Southern California where the temperature doesn't get any lower than 30 degrees. Does anyone know what the problem is? And a cost effective solution? I drive a 1998 BMW 528i.
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Old 12-22-2014, 08:00 PM
Cabover1000 Cabover1000 is online now
One wheel roaster
Location: Belding,Michigan
Join Date: Dec 2013
Posts: 560
Mein Auto: 1998 bmw 540i
There is a sensor under the right front side of the car, that's the sensor you need to look at. some thing from the road may have taken it out or just the connection may be corroded.
1998 540i sport/cold weather package.

1999 528i sport premium
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Old 12-22-2014, 08:15 PM
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Fudman Fudman is offline
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Location: Sudbury, MA
Join Date: Apr 2007
Posts: 6,356
Mein Auto: '02 530i Sport auto
The sensor is mounted on the right front wheel well liner, just in front of the tire.
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Old 12-22-2014, 08:43 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 22,086
Mein Auto: 02 BMW 525i M54 auto 130K
Typing /-40 f3 in the bestlinks nets background information ...
- Outside ambient temperature sensor reads -40 on the cluster (1) (2) (3) (4) (5) & how to calibrate the ambient temp sensor (1) & how to change OBC MID IHKA KTMP temperature from degrees Celcius to Fahrenheit (1) (2) (3) (4) (5) (6) (7)
Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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