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I have a 2005 1.9TDi. Over the past few weeks it has developed a horrible fog horn style noise when i switch it off. It last for about 5-10 seconds and comes from within the engine bay area.
Should i be worried.
 

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not sure if the diesels have them, but my old petrol vec used to do that , was told it was the secondry air pump.... and quite common ( on vecs anyway)

Bob
 

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Do you mean the car sounds like its breaking wind cos if so I have had 3 1.9 CDTIs and they all did that but only for about a second or so. So if yours is doing it for that long sounds like something maybe partially blocked somewhere?.
 
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