P CODES (POWERTRAIN) P0400 - P0499 P0420

I Have A Po420 Code On My Car And I Don't Know If It’s My O2 Sensor Or My Catalytic Converter Is Bad Or What. I Don’t Have A Bad...

I Just Had My Code Checked And It Said That It Was A P0420 Code And It Had Another P0420 Code With Some Symbols Beside It. How Do I Know If...

So My Truck Threw A Code P0420. I Replaced The Oxygen Sensor Before The Catalytic Converter, Cleared The Codes And The Same Code Popped Up...

I'm Back, We Talked About This Before. Wagon Shut Off Today Pulling Into A Parking Spot. Started Right Up But Had To Turn It Off And...

I Have A Live Data Freeze When Code Occurred.

I Have The Check Engine, Vsc, And Trac Off Lights On My Instrument Panel. When I Have Had It Checked, I Was Told It Was Reading P0420 -...

My Vehicle Listed Above Has Had A Ton Of Issues. The Biggest Was Replacement Of The Timing Chain, Now It Burns A Little Oil. The Dealer...

I Took My Son's Car To O'riellys For A Diagnostic Because The Check Engine Came On And One Of The Codes That Came Up Was P0420. Is...

I Have A 2002 With A P0420 Cat Code. The Factory Cat Was Replaced A Couple Of Years Ago After Becoming Clogged, And Had No Issues To Almost...

What All Should I Look At With Cat Code P0420? It Seems To Not Have A Lot Of Power At Times, 02 Sensor Possible. Bank 1? I'm Getting A...