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MK4 Mondeo 2.0 TDCi hissing noise problem

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Hi guys!

Got this issue that kicked in a couple of weeks ago.  The sound is most prominent at around this position under the car.  As the YouTube description says, it's on overrun, liftoff, acceleration.  Maintaining speed on level ground makes it go away (though it might still be there).

The cars performance is affected a little.  It doesnt accelerate in silly ways before, its MPG has dropped by 5-10 and it isn't responsive as it was.




Hope you can, thanks!

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