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Depends on how bad it is. If you notice a foul smell, loss of power, and poor fuel mileage it needs replacing ASAP. Know that they normally do not go bad and something has caused this. So you need to find out why it went bad before replacing it.

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Q: Is it important to replace the Catalytic converter on my 2005 Nissan Altima 2L Its very expensive cant afford it How long can I drive without replacing it?
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