P CODES (POWERTRAIN) P0400 - P0499 P0420

Took Car To Autozone And Got This Code, Definition Is Catalyst Efficiency Low Bank 1. What Does It Mean And How Can I Fix It To Pass...

I Have Replaced All The Cat's (3) And The Same Code Still Comes Up. I Will Be Checking For Leaks, But I Dont Think That Is It. Took It To...

Hi, I've Been Having The Same Problem With This Car For Maybe A Few Weeks Now And Cant Figure Out What It Is. I Checked All The Vacumm...

Can Too Much Back Pressure Caused By A New Midpipe Cause A False P0420 Code?

I Have A 98 Pontiac Thansport, It Has A P0420 Code I Cant Figure Out What I Would Look For In The #1 Bank Doug

I Have A Dodge Caravan 2002 With A Code Po420 What Does That Mean? Runs Fine, No Noices

P0420 Code On 2001 Mitsubishi Galant

What Would Case A Code Po420 And How Would I Fix The Problem

I Have 6 Codes Po420 Po430 Po1320 Po305 Po420. What Can I Do To Fix The Codes?

My 2003 Dodge Ram 1500 Gives The Below Error Could When Tested? What Needs To Be Replaced To Fix The Problem? P0420 Catalyst System...