P CODES (POWERTRAIN) P0400 - P0499 P0421

Hey Guys. Love The Site. I Have A 2002 Toyota Camry 4cyl. Le With A Check Engine Light On Most Of The Time. I Was Able To Retain A Fault...

Mil On, Went To Check For Code, It Show P0421, Last Year Replaced Cat. Coil Packs, And Cables +sparks, Found Different Code And I...

Hello All. Please Help Me Out! :-( I Love My Car! I Have A Stock 2002 Mazda Protege5. There's No Shortage Of P0421 Threads On This...

I'm Getting That Code, But I Do Know That The Bank 2 Sensor 2 Is Bad. I Have Changed It 2 Times And It Still Shows That It's Not...

This Morning My Check Engine Light Came On And Its Reading P0421 Warm Up Catalyst Below Threshold Bank 1. What Exactly Is This? What Does...

I Have This Mitsubishi Eclipse Rs Which I Purchased About A Month Ago And Everything Is Working Except I Have A Code P0421. I Had It...

We Took The Car In For Emissions And The Cat And Sensors Were Bad. We Replaced Them With Exact Oem Direct Fit Parts And Did Two Recalls On...

Trying To Find The Location Of Bank One Sensor 2 02 Sensor.

Hello, Check Engine Light Has Been Coming On And Turning Itself Off For The Last Few Months. It Is Steady, Not Blinking. I Was Told...

Obd Code Po421 Changed The Catalytic Converter Recently. Engine Would Hardly Go Over 15 Mph. Repaired Broken Valve #2 Cylinder. New...