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got bmw 328i engine code p0420 bank 1 what part do i need

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Need to know what. Part i need to fix

Vehicle: bmw 1996 328i v6

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P0420 Catalyst system efficiency below threshold (Bank 1)

Before any catalytic is replaced , the engine performance needs to be in good shape. There should not be any misfire present, should not be burning any oil, Catalytic convertor do degrade due to mileage and use.

 

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