P CODES (POWERTRAIN) P0400 - P0499 P0420

I Had A Tech Hook Up The Machine And He Gave Me This Code. P0420. He Said It Was Catalyst Or The O2 Sensor. Can U Help Me

I Removed The Cat Converter, But There Seems To Me No Damage Visible. Please Advise

I Bought My Car At An Auction So I Did Not Know Anything About It Or What It Had Been Through. So When I Picked It Up No Water In The...

My Check Engine Light Comes Once Every Month. The Code Is P0420. Can I Test The Rear Cat By Checking The Inlet And Outlet Temp Of The...

P0420 Was On, Cats Were Replaced With Bosal California Approved Cats As Well As New Denso Sensors. Readiness Set, No Codes For Several...

I Saw Several Messages Posted On This Issue And Wanted To Make Sure I Fully Understood What The Issue Is And The Steps To Correctly...

Obd 11 Scanner Keeps Coming Up With P0420 Code, Something Keeps Triggering The Check Engine Light To Come On And Have No Ides What. Changed...

Getting A P0420 Code. Is There Any Way For A Diy'er To Determine If It's The Actual Catalytic Converter? And I've Tried To Look...

I Have A 1997 Ford Taurus. The Check Engine Light Is On In The Car. I Have Recently Replaced Both Downstream O2 Sensors And Reset The Check...

I'm Hoping Someone Can Offer Some Assistance. I've Got The Vehicle Listed Above T6. Literally Just Got It Yesterday Shipped From...