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Whistling turbo does not mean it's bad sounds more like a leak.. but the discovery sports have major turbo failures up to 2017 year . Do a search on the web for this. From what I remember poor casting design. There is a baffle or piece of metal that comes loose inside manifold then destroys the turbo. Hopefully just an air leak. Let us know what you find....
 

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2016 DS HSE Auto Gas/petrol
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Almost all whistling sounds are caused by air leakage specifically when accelerating. Check for loose clamps and cracked hoses on both sides of the turbo including inlet and pressured from the turbo to the intake. Special care to look at the inter-cooler connections.
Signs of a bad turbo are , poor performance, oil consumption and smoke, the computer will also give an error. IN the past (and some do it now) people tried to make the turbo whistle. SAAB had a bypass valve that would make a HOOT and made the car sound special.

Would try a different garage.
 
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