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How do you fix a p0420catalysteffiencybelow thrsehholdbank1?

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Anonymous

∙ 15y ago
Updated: 8/17/2019

When I had that problem on my 1997 Buick lesabre, I had to replace the catalyst converter and the 02 sensor on it. It resolved the issue with the code.

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Wiki User

∙ 15y ago
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