Exhaust system, checking for leaks: Operation

Fig 1: Exhaust System Joints And Connections

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Check the exhaust system by spraying a soap solution on all joints and the connections between the cylinder head and the rear three-way catalytic converter (TWC) (diesel engines) or the heated oxygen sensor (HO2S) (gasoline engines).

• Only very small and slow bubbles are permissible.