HOME
ASK A QUESTION
REPAIR GUIDES
BECOME A MEMBER
LOG IN
Login with Facebook
OR
Remember me
NOT A MEMBER?
FORGOT PASSWORD?
CONTACT US
PRIVACY POLICY
TERMS AND CONDITIONS
☰
Home
Topics
Trouble Codes
P Codes (Powertrain)
P0400 - P0499
P0421
P CODES (POWERTRAIN) P0400 - P0499 P0421
Select Make
All Makes
Acura
Alfa Romeo
AMC
Aston Martin
Audi
Bentley
BMW
Buick
Cadillac
Chevrolet
Chrysler
Citroen
Daewoo
Daihatsu
Datsun
Dodge
Eagle
Ferrari
Fiat
Fisker
Ford
Geo
GMC
Holden
Honda
Hummer
Hyundai
Infiniti
International
Isuzu
Jaguar
Jeep
Kia
Lancia
Land Rover
Lexus
Lincoln
Mazda
Mercedes Benz
Mercury
Merkur
MG
Mini
Mitsubishi
Nissan
Oldsmobile
Opel
Peugeot
Plymouth
Pontiac
Porsche
Proton
Ram
Renault
Rolls Royce
Rover
SAAB
Saturn
Scion
SEAT
Skoda
Smart
Subaru
Suzuki
Tesla
Toyota
Triumph
Vauxhall
Volkswagen
Volvo
PREV
1
2
3
NEXT
2002 Toyota Camry 2002 Camry Fault Code 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...
Asked by
topherbro
·
1 ANSWER
2002
TOYOTA CAMRY
VIDEO
How to Read Codes
Instructional repair video
2001 Mazda Protege P0421
Mil On, Went To Check For Code, It Show P0421, Last Year Replaced Cat. Coil Packs, And Cables +sparks, Found Different Code And I...
Asked by
Guayas007
·
2 ANSWERS
2001
MAZDA PROTEGE
P0421 (sometimes P0300 And P0660)
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...
Asked by
sailingsenses
·
1 ANSWER
2002
MAZDA PROTEGE
Code P0421?
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...
Asked by
Choome
·
5 ANSWERS
11 IMAGES
2006
MITSUBISHI ECLIPSE
VIDEO
How to Read Codes
Instructional repair video
What Exactly Is Code P0421
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...
Asked by
beautifulhazleyes
·
1 ANSWER
2003
DODGE TRUCK
2002 Mitsubishi Eclipse P0421
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...
Asked by
hmoore7
·
1 ANSWER
2002
MITSUBISHI ECLIPSE
Reset The Codes And Now PO421 Has Come Back. What Is...
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...
Asked by
RACHELLE
·
1 ANSWER
2002
MITSUBISHI LANCER
Code P0421
Trying To Find The Location Of Bank One Sensor 2 02 Sensor.
Asked by
Dartanian Benson
·
1 ANSWER
1 IMAGE
2004
HYUNDAI SONATA
2004 Volkswagen Passat PO421 Bank 1
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...
Asked by
RSM
·
3 ANSWERS
2004
VOLKSWAGEN PASSAT
2003 Hyundai Santa Fe OBD11 Code P0421
Obd Code Po421 Changed The Catalytic Converter Recently. Engine Would Hardly Go Over 15 Mph. Repaired Broken Valve #2 Cylinder. New...
Asked by
Dale Blackwell
·
1 ANSWER
2003
HYUNDAI SANTA FE
PREV
1
2
3
NEXT
Ask a new Topics question
Sponsored links
Ask a Car Question. It's Free!
SPONSORED LINKS
Online car repair manuals