2003 E46 330D - problem with reversing sensor

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  1. 2003 E46 330D - problem with reversing sensor 
    #1
    OM2
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    I've got a problem with my car
    About 4 months ago, it developed a problem: the reverse sensor will start beeping when I start to reverse from a fresh start

    If I've driven a little, then the reverse problem won't happen

    The problem would only happen 30% of the time - now it's more like 80%

    Before, if I moved forward slightly and then reversed, the problem would go away
    Now, it doesn't :(

    I've looked at the sensors and one of them looks to have a slight scratch on - could this be the cause of the problem?

    I'm not sure where to go with this problem - surely to fix will be a fair amount of work - since I assume you have to take apart the back bumper and other things?

    Is this a common problem?
    Is it an electrical one? (Any guesses from the information given above would be great!)

    Thanks


    OM
     
     

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    #2
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    next time try turning the key to posistion 2 without fireing engine up, walk to back of car and put your ear to the sensors, they should be clicking, if one of them isnt it needs replacing ..
     
     

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    aah... ok - thanks for the tip
    i'll do this tomorrow morning

    if one of them does need replacing, can i just pop it out and put another back in?
    i assume it's not that simple?
     
     

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    I presume your sensors are in the bumper trim rather than the bumper itself, in which case you should just be able to prize the trim off and swap the sensor. The sensors are just held in with a retaining clip so that bits easy!
     
     

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    i've tried turning to position 2... but i dont hear ANY clicking at all
    are you sure the clicking will still be there when i walk to the back?
    let me know - the problem is really bad now

    ALSO: where do i get a sensor from?
    i've seen one or 2 for sale on ebay - where else could i buy from?

    let me know

    thanks
     
     

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    ok, i got someone else to put their ears next to the sensors as soon as i turn to position 2
    and there is clicking
    the clicking only last for 1.5 seconds - very hard to turn to pos 2 and run to hear!

    all sensors are working
    the only thing i can see is a scratch on one of the sensors
    i assume this must be the faulty one

    not sure if this sounds dumb, but maybe i could sand down the scratch with really fine sandpaper?
    does that sound like a good idea?

    i'll call bmw and get a price on a replacement sensor

    question: if u can just pop out sensors, then is this a big problem - with lots of thieves going round prising open sensors and then selling??

    i asked someone and they said that there could be a cable somewhere that could only be got to by coming from inside somewhere?
     
     

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    hi read your problem the sensors are on a wireing cable and they independtly conect the cable runs from near the battery tray area i think and you have to take the black plastic outer trim off to remove the sensors i have some spare one from a car i did last year rich
     
     

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    Quote Originally Posted by fast2loud View Post
    hi read your problem the sensors are on a wireing cable and they independtly conect the cable runs from near the battery tray area i think and you have to take the black plastic outer trim off to remove the sensors i have some spare one from a car i did last year rich
    thanks rich
    see the pm i'm sending u now

    how easy are they to fit?

    let me know
    thanks

    one of the sensors is scratched - i'm assuming this is the faulty one and causing the problem
    but the thing is, the problem only occurs from a fresh start
    if i've been driving for 5 minutes and stop and reverse, the problem will no occur
     
     

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    Ive got the same problem with mine, just a constant bleep when reverse is selected, if i take it out of reverse then back into reverse they don't work at all no bleeping?

    Did you solve your problem? If so let me know!


    Eibachs fitted 16/02/2010 looking
     
     

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    no... i haven't solved yet
    i asked someone who does work on my car
    he said it definitely wouldn't be easy as just pulling one sensor out and putting another in!
    he said u'd have to dismantle quite a lot - and depends on the wiring u have in place

    i called bmw, and they told me that the sensor would cost £39.99
    but, then there's about 2.5 hours labour required

    don't have much money splashing around right now - so decided to leave

    the problem has got a lot worse - before i wouldn't get the beeping when i drove the car for 5 min or more
    now - it still happens

    AND it damn winds me up!!!!!!!!!!!!!!
    when u have sensors, u get lazy!
    no need to look behind - or at least not concentrate
    now, i have to do!! :(
     
     

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