2582497 - S05 ENGINE HISSING

There is buzzing (low frequency noise) coming from the engine, whose intensity varies with the number of revs

		Results of the tests
1	CHECKING AIR INTAKE CIRCUIT	All OK	Problems met	Operation
	Check the condition and seal of the air supply circuit	Continue to Step 2	Circuit component damaged	Replace the component involved
2	ENGINE EXHAUST CHECK	All OK	Problems met	Operation
	Check the engine exhaust system and, in particular: Piping Exhaust silencers Catalytic converter gaskets	Continue to Step 3	Pipe damaged	Replace the pipe
			Rear silencer damaged	Replace the silencer Op.   1076B20
			Gasket worn or damaged	Replace the gasket
3	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'