P CODES (POWERTRAIN) P0400 - P0499

I Have Two Problems. First, Will A Bosch Platinum +2 4302 Fit My Engine. Second I Have A P0420 Bank 1 Code. How Can I Narrow It Down Cat...

Engine Problem 2003 Toyota Corolla 4 Cyl Wheel Drive Type Unknown Automatic 88400 Miles I Had A Diagnostic Test Done At Autozone...

Wondering If Any Saturn Techs Still Here That Might Have Some Ideas About A P0420 Low Catalytic Converter Efficiency. Thanks.

Check Engine Code P0420.

I Used My Programmer To Get Code P0420 And So I Took It To A Midas To Have Them Take A Look. The Guy Told Me That I Needed To Replace My...

Hi, My Car Keeps Throwing A P0420 Code On My Code Reader, But No Engine Light Is On. Should I Be Worried? How Can I Diagnose The Fault...

Code P0420 Catalyst System Efficiency Below Threshold (bank 1 ). How Do I Correct This Problem

I Have A 2001 Gmc Sonoma 2wd 2.2 Liter And Have The P0420 Code For Catylyst Efficiency Low Bank One. I Have A New Cat And Rear O2 Sensor So...

Hello Everyone, I Scanned My Car And The Error Code Is P0420. The Catalytic Converter Has Been Changed. The The Manifold Was Cut Open And...

I Have A 2000 Mazda 626 V6. For The Last Couple Of Years The Check Engine Light Comes On With A P0420. It Might Come On For A Couple Of Days...