Whistling noise from turbocharger (A20NFT/LHU)

/ 9-3 (9440) / 2012 / 2. Engine / 4-cyl petrol/E85 / Turbocharger system / Fault diagnosis, fault symptoms / Whistling noise from turbocharger (A20NFT/LHU)

Criteria	Event
Leaks or obstructions in the air intake	Check for leaks or obstructions in the intake to the turbocharger.
Leaking exhaust system or exhaust system with limited function	1. Check for leaks in the exhaust system. 2. Check whether the exhaust system has limited function.
Leaks or obstructions in the intake system	1. Check for leaks. 2. Check for obstructions.

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