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Refusal каталитического neutralizer can occur for the several reasons though, usually, it is process gradual, to catch which without the special equipment it is impossible.
"Core" of the majority of catalysts is made of ceramics - a material known for the fragility. The car can get for the speed to a hollow, hit about something or even is simple to "strike" the catalyst case on a stone, and from it каталитический "brick" can burst. After that loss by "core" of the working qualities – time business.
The converters of new generation containing a metal monolith, are not so vulnerable in this respect. To break them, of course, it is possible, but, anyway, not so it is simple.
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