whining noise when i accelerate. What could it be?

  • Thread starter Thread starter Dave
  • Start date Start date
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Dave

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i have a 2006 peugeot 407 1.6HDI with 92,000 miles on the clock.
Ive just noticed a low pitch whining noise coming from the engine while i accelerate.
It comes it gears 1 2 3 and 4. It goes away when i depress the clutch.
what could it be?
is it expensive?
please help thanks
 
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