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  Catalytic converter regeneration BMW X5 E70 3.0 272 hp N52B30 2009.

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  The cartridges did not look bad while the computer reported a low catalyst efficiency error on two banks so four cartridges to be replaced. By the way, I will mention that the indicator of wear and tear of catalytic converters is not always their appearance, they may look very good and may no longer work as a result of natural wear of the precious metal elements contained in the catalytic converter cartridges as was the case here. 

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