CHEVROLET P CODES (POWERTRAIN) P0400 - P0499 P0420

Coming Home Today, The Check Engine Light Came On. Took To Auto Parts Store And Put Code Reader To It. Came Up Code P0420. What Does This...

Caty. Conv. Efficiency Low Bank One. The Converter Has Been Replaced And The Code Later Appeared Again. The Oxygen Sensor Was Then Replaced...

Computer Problem 2002 Chevy Impala 6 Cyl Wheel Drive Type Unknown Automatic 97809 Miles What Can I Do To Fix This? Catalyst...

My Servie Engine Light Is On My Friend Looked Up The Code And It Said. Catalyst System Efficiecy Below Threshold [bank 1] What Does This...

I Am Still Receiving A P420 Code After Replacing The Entire Exhaust System Including The Exhaust Pipe, Cat Converter, O2 Sensors Before...

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...

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

Engine Performance Problem 2000 Chevy S-10 6 Cyl Four Wheel Drive Automatic What Do I Need To Repair To Correct This Trouble Code? ...

Hello, I Have The P0420 Code On My Car. I Have Replaced The O2 Sensor And Have Run Cataclean Through It And The Code Has Not Cleared. When...

P0420 Code Sets. Replaced The Cat Because Of The Milage At A Local Muffler Shop And The Code Continues. Replaced The Post O2 With One From...