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Catalyst efficiency below threshold

Old March 18th, 2018, 12:33 PM
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Default Catalyst efficiency below threshold

New cat and new o2 sensors and still have an enigine light with error of catalyst efficiency below threshold. How can this be?
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Old March 18th, 2018, 8:56 PM
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so you cleared the codes with a scan tool and the test ran and failed.
did you buy a quality cat or a cheap weld in cat?
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