The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car's exhaust or fuel systems.
P3078 Throttle Control: Airflow at Idle too Low.
Possible Solutions:
Clean Throttle Body, Perform Throttle Body Alignment (TBA).
Check for Intake Leaks, including PCV system and Evap (N80) solenoid.
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