P CODES (POWERTRAIN) P0400 - P0499 P0420

Vehicle Is Throwing P0420, Catalytic Converter Was Replaced Last Year (but Son Drove It Around Campus For Months With Code Returned). Live...

2001 Pontiac Grand Am 3.4l V6 P0420 Catalytic Efficiency Bank 1 Code Was Tripping Every 15 Miles. After Replacing The Thermostat Which...

Hello, I Have A 2000 Camry With 4 Cyl Engine And Ca Emissions. The Car Overheated Due To Broken Water Pump, And I Replaced The Cylinder...

Got The 0420 Code, O2 Sensors Checked Out Okay, Both On Obdii And With An Ohm Meter. Less Than 50 Degrees Temperature Difference Between...

I Have A Problem With The Same Code (p0420) Coming Back. I Own A Actron Auto Scanner Model Cp9180. I Look The Code Up And I Get Catalyst...

I Love Reading Your Site And Now It Is My Turn To Ask You For Advice. I Have A 97 Toyota Camry 4 Cyl With A Code Of P0420 Catalyst...

I Failed My Emmisions Test. The Error Code Reads P0420: Catalyst System Efficiency Below Threshold (bank 1). I Have Been Told This Is O2...

I Have A 1997 Camry V6.I Had To Replace The Exhaust Manifold Pipe. On This Car The Converter Is Incorporated Into The Exhaust Manifold Pipe...

I Have A 1999 Chrysler Cirrus With This Code P0420 – Catalyst System Efficiency Below Threshold (bank 1) Sr. With This Code Analysis What...

My Vehicle Feels Like It Is Stuck At 3,000 Rpm's And 40 Mph And When I Push Harder On Acceleration Pedal It Will Slowly Climb Past 3000...