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yes,but the most common cause for this code is running your car too low on gas (below 1\2), or low octane before you replace your catalytic converter goto your nearest parts store a get 1 bottle of octane boost and fill your car with premium gas(i know), then have someone clear the code for you. this should help your problem if not check with your dealer most cats have 8yr/80,000 warranty.

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Q: Do you need a new catalytic converter on a 2000 Mazda Miatas if it has 27000 miles on it and the check engine light comes on with Code P0420 Federal emissions catalyst system below threshold?
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