Hi all,

I was scanning my car for any code with my OBD tool and I got a pending code for P0420 Catalytic converter system, Bank 1 efficiency below threshold.

I dont have any check engine light and the car drives and get great MPG. Is this sign the O2 sensor going bad? I know the Bank 2 sensor means the CAT is not working as it should and most likely the CAT is bad..

I searched the form and almost all with the code was trying to replace the Catalyic converter . The car passed smog Oct 2020 so just trying to figure out what I need to be ready for

I scanned my wife's Toyota Highlander and a friends Nissan and both had the same message so wondering if something else with the scanner or software.

Thanks

Thanks

 

https://www.engine-codes.com/p0420_acura.html

P0420 ACURA Possible Causes

What does this mean?

• Faulty Three-way Catalyst Converter Bank 1
• Exhaust Tube
• Intake Air Leaks
• Faulty Oxygen (O2) Sensor
• Faulty Fuel injector(s)
• Leaking Fuel Injector (s)
• Faulty Spark plugs
• Improper Ignition Timing
• Faulty Engine Control Module (ECM)
• Dirty Air Filter

 

*UPDATE*


I purchased Motorkote Catalytic & Exhaust treatment after about half tank 200 plus miles The pending code for "P0420 Catalytic converter system, Bank 1 efficiency below threshold" is gone.

I read the reviews and it all had positive feedback on Amazon.