| 1. To check reliability of fastening of collars. |
| 2. To examine by means of a lamp lack of the openings which rusted and the wiped parts. |
| 3. To replace strongly rumpled exhaust pipes. |
| 4. To check twisting and extension rubber support for porosity, if necessary to replace. |
| 5. Petrol engines: to check a cable a lambda probe. In the presence of damages to replace. The probe is screwed in in an exhaust pipe in front of the catalyst. |