P0421 warm UP Catalyst Deterioration 1 Nissan days rocks

How To Fix P0421 Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1)
A P0421 Code is set when the catalytic converter falls below 95 percent efficiency.
How To Test Oxygen Sensor Heater Element Video:
• How To Test Oxygen Sen...
Possible Causes of a P0421 Code:
Failed A/F Oxygen Sensor
Wiring (Open or Short)
Exhaust Leak
Faulty Catalytic Converter
How to p0421
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How to solve
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