P0430, “Catalyst System Efficiency Below Threshold (Bank 2)” means the issue triggering it is happening in Bank 2 (where your vehicle’s cylinder number 2 is located).Īccording to our mechanic, “Generally, this code means that you need a new catalytic converter.”.P0420, “Catalyst System Efficiency Below Threshold (Bank 1)” means the problem causing it is happening in Bank 1 (where your vehicle’s cylinder number 1 is located).What are these “Catalyst system efficiency below threshold” codes, and how do they differ? Each code indicates where the problem triggering them is located: What are codes P0420 and P0430, and what do they mean? You can watch more videos like this in our video library.
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