Hello 7th Gen Maxima crowd. Happy New Year! I keep getting this generic code P0430 "Catalyst System Efficiency below threshold Bank 2. I did swap out the #3 cylinder coil. Which means I took the Intake off the car to get to it. Should i have replaced the intake gasket before putting the intake back on? It semed to be in good shape.
Or could it be a bad OS sensor? I'm hoping it isn't the converter going bad. But the car does have 224K on it. I followed the removal guide lines given online and the same for reinstalling the intake. Torque specs followed as well.


Any suggestions?

 

Hello, I believe that’s a code for a lazy Oxygen Sensor.