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the warranty is about 2-5 years for a good warranty, 80,000 miles, but a recall was posted on 96 and 97 Cherokees and Wranglers that will get it replaced for free if it starts rattiling, call your dealer with the recall e-22 and your last 8 of your vin to see if it has already been performed, this will allow for the reprogramming of the pcm and replacement of the cat if it is rattilng or wasted. On the up side you get a new cat and the pcm reprogrammed to detect issues with emissions, on the down side, you will now get codes for emission problems.

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Q: How long is the warranty on a catalytic converter for a 1997 Jeep Cherokee?
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