P0420 is a Diagnostic Trouble Code (DTC) for “Catalytic System Efficiency Below Threshold (Group 1).” Its’s up to the mechanic to diagnose the specific cause for activating this code in your case.
What Do you Know About Code P0316 and How Can you Fix it?
Code P0316 is one of the most common OBD2 trouble codes. Read the full article below to find out what it means, how to fix it, and what other codes may be displayed in connection with it.
Fixed: Engine Power Reduced
This article will take a detailed look at what can cause engine power reduction, how to bypass engine power reduction, and how to fix engine power reduction.
