2009 Range Rover Sport Supercharged P0420 Bank 1
 

I have a vehicle that has a P0420 code on Bank 1 a 2009 Range Rover Sport (Supercharged). The vehicle runs fine, and I'm in the process of running Cat cleaner. If the cleaner doesn't work I plan to purchase a Cat from Rock Auto and use the Davico part.

My first question is: Which side is Bank 1? I thought it was the left driver-side Cat on US models. Now I think I'm wrong. I'm seeing a ton contradicting online information and figuring we can add to it; lol.

Second, has anyone had any problems with a Davico Cat on the Range Rover? I used one on My Disco2 and works very well.

Third, I'm thinking as long as a new Cat is going in, I might just as well put some new O2 Sensors from Atlantic British on it. O2's were pretty tricky on the 2002 Disco, Are Range Rovers just as picky, or Atlantic British work just fine.

Hopefully this isn't too much too unpack.
Thanks.

Atlantic British
 

Atlantic British states Bank 1 on US Models is always drivers-side Left hand.