Recommended periodicity: each 50 000 km of run or 24 months.
Check of system of release of the fulfilled gases make in some hours after engine deenergizing.
For an easy approach to system of release of the fulfilled gases lift the car on the lift.
Check up pipes and their connections on absence of leaks of exhaust gases which testify to their serious corrosion or damages.
Check up a condition of arms and suspension brackets of system of release.
At the same time examine the car bottom on absence of through apertures, the corrosion open seams etc. through which the fulfilled gases can get to car salon. Cover with silicone hermetic all found out apertures.
Check up, that elements of system of release of the fulfilled gases have been established freely, without pressure, with a sufficient backlash concerning body elements.
Check up an engine condition, examining an internal part of an exhaust pipe. If the pipe black also is covered by a layer of soot or white flakes, means, the engine is necessary for adjusting, including full survey of fuel system.