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Catalyst efficiency below threshold


cry_elliott's Avatar
Newly Registered

Join Date: Mar 2018
Posts: 1

March 18th, 2018, 11:33 AM   #1  
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?

 
tech2's Avatar
CF Monarch

Join Date: Mar 2011
Posts: 5,745

March 18th, 2018, 7:56 PM   #2  
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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