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The fourth generation Nissan Altima (chassis model L32A) was announced at the 2006 New York Auto Show on April 12, 2006. It was the first vehicle to use the smaller Nissan D platform, with a new front and upgraded rear suspension.

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How do I fix my Nissan catalyst?

I just need a guide to fixing my catalyst

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@zakiyaenca49086 not sure what you are referring to by trying to fix it. A catalytic converter needs to be replaced not fixed. Use something like this video to work on that.

Essentially you remove the exhaust system and then the 3-way catalyst Here is more about this from the workshop manual ExCatalyst Removal

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Zakiya Encarnacion crwdns2934231:0crwdne2934231:0
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