Checking For Air Leakage In the Exhaust System

Air leakage exhaust system, check

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

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.

Removing / installing

Removing components





Note! Use rust solvent or similar on the nuts.

Remove:
- the nuts at the junction between the three-way catalytic converter (TWC) and the exhaust system
- the gasket. Separate the exhaust system from the three-way catalytic converter (TWC).
Install the tool (1). Use: 999 7085 Adapter 999 7085 Adapter together with a new gasket.




Install pressure regulator 999 5544 REGULATOR 999 5544 Regulator on tool 999 7085 Adapter 999 7085 Adapter. Adjust the pressure to 0.4 bar.

Check
Check the exhaust system. Spray 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.

Installing components

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

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