2001 E46 320d tourer external temp sensor(SOLVED)

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  1. 2001 E46 320d tourer external temp sensor(SOLVED) 
    #1
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    Hi all,
    Anyone any idea where the external temperature sensor is located?

    Mine is constantly showing -40c !!!!

    Not sure what is causing this fault and was hoping it just needs replacing.

    Any advise on if this is possible and what a replacement may cost would be appreciated.

    Cheers....
     
     

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    located just under the front bumper on the passenger side. Pretty much behind the spot light.
     
     

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    A ha...! Great stuff. Will have a look. I take it behind spot light yr refering to fog light in lower bumper.

    Cheers !!
     
     

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    Mine was the same. Turned out that the wiring to the sensor had been cut/ripped off close to the sensor. Ended up taking the wiring connector apart and soldering the wires back together (Which wasn't as easy as it sounds as I was doing it outside at near freezing temperatures so the solder was not getting hot enough for long enough!!!) Made a mistake removing the sensor from its plastic mounting on the wheel arch shield, it was so cold that the plastic lugs broke as I tried to remove the sensor. Moral of this story is don't work outside in very cold weather, yours fingers don't work very well and can't feel things properly, solder doesn't flow well, and your nose runs and drips on everything!!! Lol
    So I now have at some point to either buy a new arch shield to refit the sensor or try to glue the lugs back on. At the moment my sensor is tucked up on top of the arch guard rather than clipped in exposed to the open air. So mine doesn't give quite true temperature readings as after a little while it gets some heat from the radiator etc and reads a few degrees warmer than it should. (Another job I'll get round to soon!!!)
    Last edited by Westfield1989; 19-03-2010 at 08:32. Reason: Additional comment
     
     

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    Hi Westfield 1989,

    Ive had a quick look under car by passenger arch shield. Ive found 2 wires hanging down, stripped at the ends...im guessing they connect to temp sensor but cant see where the sensor is,its hanging down behind the passenger side front fog light. Can you give me a better location where to look, is it actually attached to the inner side of the wheel arch protector? Do I need to jack car up or put it on ramps to see it? I suppose its possible its fell off at some point, in which case im looking for something that isn't there.....
     
     

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    yea im yet to run one down,got the wire ready,and plugged. but still unsure where to attatch it,in the airflow or beside it,or in the wheel arch. this is wots stopping me finishing it..?
     
     

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    Heres a photo
    Attached Images
     
     

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    so that would be the same on a e36? and is that the inner arch?
     
     

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    On an E46 (not sure about E36) you can see the sensor from underneath in front of the passenger front wheel. There is a recess in the bottom of the arch guard that the sensor clips into and the wires go through and up the body workto the loom on the chassis leg. Be careful with the plastic lugs that hold the sensor ( I broke mine in very cold weather). If you are not sure if the wires you see hanging down are the right ones you can match the colour markings.diameter to the ones that come out of the back of the connector on the sensor. I found it easy to remove the lower section of the arch guard in front of the wheel, it should all become obvious then. I seem to remember reading somewhere that BMW do a repair kit for the connector and wiring, but I could be wrong. My repair worked but isn't exactly pretty. When I have more time and the weather is much better I'll do a much neater job, probably take the connector all apart again and put the wires into the spade terminals so that there is no solder join. May have to invest in a new lower arch guard so I can mount the sensor properly. To get true temp readings it should sit in the clips in the recess so that it is exposed to air that goes under the car (but not in direct air flow as that would give falsely cold readings due to wind chill factor). As I said before, mine is temporarily just stuffed up through the wiring hole just resting on top of the flat bottom bit of the arch guard, which means I get falsely high temp readings due to heat soak from radiator and engine etc. When I eventually get round to doing a proper job I may take some photos and do a step by step guide, but that may not be until the summer.
     
     

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    Thanks for that m8. Was planning to have a go this morning, but will have to wait til rain stops...
     
     

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