		TEST RESULTS
1	AIR INTAKE CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition and seal of the air intake system	Move on to Step 2	Circuit component damaged.	Replace the damaged component.
2	ENGINE EXHAUST CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the engine exhaust system, in particular: - Manifold - Pipe - Exhaust silencer - Catalytic converter front seal.	End of diagnosis	1. Pipe damaged. 2. Rear silencer damaged 3. Front gasket worn or damaged.	1. Replace the pipe 2. Replace the rear silencer Op. 1076B20 REAR EXHAUST SILENCER - R + R 3. Replace the front gasket

There is a low frequency noise coming from the engine, the intensity of which varies with the number of revs.