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Thread: Buld fail warning but no bulb failure?

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  1. Question Buld fail warning but no bulb failure? 
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    Hi
    My 2005 A6 avant keeps coming up with a front right bulb fail warning but I can't see a bulb not working.
    Its very annoying and I still jump a mile every time the warning sounds!
    Ta
    Nick
     
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  2. Re: Buld fail warning but no bulb failure? 
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    Press the check button and see which one its reporting as a failure.
    Dan
    2009/2010 2.0 TDIe SE
     
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  3. Re: Buld fail warning but no bulb failure? 
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    Thank you Dan - tells me it is sidelight/daylight running light.
    Anyone confirm this is a W5W? Will LED bulbs show as an error?
    Nick
     
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  4. Re: Buld fail warning but no bulb failure? 
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    they will show up as an error if you have gone from bulb to LED without coding car
    VW POLO 2002 1.2 12v , Audi A6 2006 2.0 TDi SE , Skoda Fabia 1.4 TDi

    All 3 cars in the current fleet
     
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  5. Re: Buld fail warning but no bulb failure? 
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    Quote Originally Posted by niall campbell View Post
    they will show up as an error if you have gone from bulb to LED without coding car
    Sorry - what does that mean? Is it something I can do?
     
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  6. Re: Buld fail warning but no bulb failure? 
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    did your car come with bulbs when you got it ?


    stick in old fashioned bulbs and see if this cures the fault

    sometimes these capless bulbs, simply need turned upside down to work, the wee wispy wires can break off and not make a contact on one side........................ turning them upside down gets them going................................. If they are black or a mad reflective silver colour .................... they are burnt out


    The car measures the resistance needed to power the bulb. So If the LED bulbs only take 2 watts to run a 5 watt bulb, then the car thinks the bulb is faulty................... same way a bulb may be taking 7 watts to run a 5 watt bulb ...................... meaning the bulb is on its way out as its using too much juice, even though its working

    The battery has a regulator monitoring it & nowadays its connected up to a Convenience Monitor. If the battery is Low, the CM switches off certain things to stop the battery from going flat .......................... roughly.

    You need to re-program the CM to say you have LED bulbs instead of old fashioned bulbs


    To me, I would stick in normal bulbs and wait till you buy another car which will more than likely have LED fitted .................................. stick to saving money in your home with bigger bills
    VW POLO 2002 1.2 12v , Audi A6 2006 2.0 TDi SE , Skoda Fabia 1.4 TDi

    All 3 cars in the current fleet
     
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  7. Re: Buld fail warning but no bulb failure? 
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    AUDI A6 C5 CCM CONVENIENCE COMFORT CONTROL MODULE 4B0962258B 4B0 962 258 B

    this is what I am talking about. If you look at the 4B0 962 258 B number, this will be different to cars with EITHER standard bulbs OR LED bulbs

    Maybe someone with VCDS can reprogram your car ?
    VW POLO 2002 1.2 12v , Audi A6 2006 2.0 TDi SE , Skoda Fabia 1.4 TDi

    All 3 cars in the current fleet
     
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  8. Re: Buld fail warning but no bulb failure? 
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    Marvellous answer - thank you!
     
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