Exhaust System: Testing and Inspection

Checking for air leakage in the exhaust system

Special tools:
999 5544 REGULATOR 999 5544 Regulator
999 7085 Adapter 999 7085 Adapter

Note! The illustrations in this service information are used for different model years and / or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work

Removing components





Remove:
- the nut where the three-way catalytic converter (TWC) and exhaust system separate
Note! Use rust solvent or similar on the nuts.

the gasket. Separate the exhaust system from the three-way catalytic converter (TWC).

Installing tool





Install:
- The tool (1) 999 7085 Adapter 999 7085 Adapter using a new gasket
- pressure regulator 999 5544 REGULATOR 999 5544 Regulator on tool 999 7085 Adapter 999 7085 Adapter. Adjust the pressure to 0.4 bar.

Cleaning and checking

Check
Check the exhaust system by spraying a soap solution on all joints and connections between the cylinder head and the rear heated oxygen sensor (HO2S). Only very small and slow bubbles are permissible.

Finishing

Removing tools

Remove:
- pressure regulator 999 5544 REGULATOR 999 5544 Regulator
- tool 999 7085 Adapter 999 7085 Adapter.

Installing components

Install:
- a new gasket where the exhaust system and three-way catalytic converter (TWC) divide
- a new nut for the exhaust system. Tighten.
Start the engine. Check for leaks where the three-way catalytic converter (TWC) and the exhaust system divide.