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Thread: Outside Temperature Sensor

  1. #1
    Regular Member Handyandy-UK's Avatar
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    Vehicle InfoStats

    Vehicle : BMW 525i

    Trim : SE Touring

    Engine : 3.0

    Year : 2007

    Default Outside Temperature Sensor

    Given that I happen to know it's a balmy 5c outside and the OAT display in my GSi says it's anywhere between 16c and 28c as I'm driving along, I'm getting an idea that the sensor has quite possibly finally had enough.
    Understandable as it's quite likely the original part and has been getting everything the weather and roads have thrown at it since Oct 2004.

    So just out of interest and curiousity....

    I'm assuming it's a bi-metallic type working by variation of resistance due to temperature. So does anyone happen to know the resistance range of a known good sensor at normal indoor room temperature ?

  2. #2
    Regular Member lee gsi's Avatar
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    Vehicle : Signum

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    Year : 2005

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    First o fall check the plug that the bumper loom plugs into as there have been a few that were reading wrong (Mine inc) and it turned out to be the pins in that plug being corroded.

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    Regular Member beat275's Avatar
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    Vehicle : Hatch

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    Year : 2003

    Mileage : 90000

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    how did you clean the plug. mine is corroded to.

  4. #4
    Regular Member lee gsi's Avatar
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    Scrapped the corrosion off the pin and sprayed contact cleaner into the plug.

    Then plugged it in and out loads of times.

  5. #5
    Regular Member Handyandy-UK's Avatar
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    Vehicle : BMW 525i

    Trim : SE Touring

    Engine : 3.0

    Year : 2007

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    Contacts on both plug and sensor appear clean but I'll give 'em a scrape anyway in daylight.
    The weird part was I put the CD70 into testmode and scrolled to the OAT screen..... disconnected the sensor and the display decided it was 10.5c - impressive given the sensor was on the dash and not attached to anything. Plugged it back in at suddenly it decided it was 26.c ..... then 17c ..... then 23.5c .... eees craaazy !

  6. #6
    Full Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

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    Year : 2009

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    Might be worth checking the rest of the harness for damage and where the harness plugs into for corrosion
    Lois Griffin: Peter! You're bribing your daughter with a car?
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  7. #7
    Regular Member lee gsi's Avatar
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    Vehicle : Signum

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    Its not the connection at the sensor itself.

    On the prefacelift there is a bigger connector by the passenger fog light.

    See this thread: http://www.vectra-c.com/forum/showpo...76&postcount=5

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    Vehicle : vectra c

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    http://www.ebay.co.uk/itm/Vauxhall-O...item4cfe10787e

    -4 in birmingham at the mo

    my heater is still squeaking

  9. #9
    Regular Member Handyandy-UK's Avatar
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    Vehicle : BMW 525i

    Trim : SE Touring

    Engine : 3.0

    Year : 2007

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    Well I found and eventually got apart the large multiplug near the N/S front fog.... and yucky green corrosion alles uber der platz !

    I've cleaned it out the best I could and had it together/apart a fair few times to try and clean up the contacts, but it's still giving dodgy readings. Next step come next Tesco day will be get hold of a can of electrolube and squirt the hell out of the contacts.

    Incidentally, a thought occurred about possible diagnosis of sensor fault or not:

    Assume the sensor works by changing the resistance in the OAT circuit wire.

    Disconnect the sensor and the display should drop into the -28c range. Mine stayed at about 10.5c which now indicates additional resistance in the wire - so pointing toward possible corroded multiplug contacts.

    Just a thought

  10. #10
    Regular Member Ben50n's Avatar
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    WD40 will be good enough as a contact cleaner, it will also act as a dampness guard.

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