P CODES (POWERTRAIN) P0400 - P0499 P0420

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...

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...

Trouble Code P0420-catalyst System: Efficiency Below Threshold (bank 1).

What Oxygen Sensor Is Having The Problem

Catalyst Below Threshold Bank 1 Is The Only Fix For This To Replace The Converter And If So How Do You Reset The Code After Replacement Of...

Code P0420 With No Check Engine Light.(Catalytic Converter)

My '98 Suburban, 5.7l, 4sp Auto, 4wd And 176,000 Miles Is Giving The Subject Code Indicating "catalyst Efficiency Below Normal (bank 1...

Car Had 2 Codes, An Egr Low Flow P0401 And P0420 Cat Inefficient Code. Pulled Egr And Tb, Cleaned Out Egr Passages, Which Were Completely...

Hey. I Have Obdii Scan Code Of P0420 And I Looked It Up And Has To Deal With A Low Bank 1 Cat Conveter. What Does This Mean? Do You...