“I have 2004 nisan sentra the service engine light on, the code , it reads P0420 "Catalyst efficiency bellow?
“I have 2004 nisan sentra the service engine light on, the code , it reads P0420 "Catalyst efficiency bellow treshold (bank 1)"; how to fix it?” results
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it means you need to have the cat converter replaced on bank 1 of the engine.its probably going to cost you about $650 if you have a shop do it.
i would change the cat and both O2 sensors.
depending on your mileage, being an emissions issue it may still be covered under warranty.