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
Pontiac
All
Trouble Codes
P Codes (Powertrain)
P0400 - P0499
P0420
PONTIAC P CODES (POWERTRAIN) P0400 - P0499 P0420
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
Select Model
All Models
1000
3000
6000
Aztek
Bonneville
Can Am
Catalina
Fiero
Firebird
Firefly
G5
G6
G8
Grand Am
Grand Prix
Grandville
GTO
Lemans
Montana
Parisienne
Phoenix
Pursuit
Solstice
StarChief
Station Wagon
Streamliner
Sunbird
Sunfire
Tempest
Torrent
Trans Am
Transport
Ventura
Vibe
Wave
Found 8 results
Code P0420
Car Shut Off While Idling At A Light. But Not Overheat. What Is The Cause?
Asked by
chris6911
·
5 ANSWERS
8 IMAGES
2005
PONTIAC AZTEK
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
GUIDE
Check Engine Light
Why is my check engine or service engine soon turned on? In this guide we talk about what this is associated with this notorious light, what it is used for and what you...
2001 Grand Am P0420 Code
2001 Pontiac Grand Am 3.4l V6 P0420 Catalytic Efficiency Bank 1 Code Was Tripping Every 15 Miles. After Replacing The Thermostat Which...
Asked by
InvestWithDane
·
4 ANSWERS
2001
PONTIAC GRAND AM
P0420 Code
Got The 0420 Code, O2 Sensors Checked Out Okay, Both On Obdii And With An Ohm Meter. Less Than 50 Degrees Temperature Difference Between...
Asked by
mondofox
·
10 ANSWERS
2007
PONTIAC G6
2003 Pontiac Vibe 2003 Vibe P0420 Code
Hey, Guys I Replaced The Trans. Bearings, Took Car For A Ride, The Engine Light Came On, I Pulled The Code P0420 Cat. Eff. Below Threshold...
Asked by
toy-8844
·
7 ANSWERS
2003
PONTIAC VIBE
VIDEO
How to Read Trouble Codes
Instructional repair video
Cannot Resolve Code P0420
Hi, I Have Been Battling This P0420 Code On My Car (gt Model) For A While Now And Was Hoping Someone Would Have Some More Insight On The...
Asked by
HVDES
·
11 ANSWERS
2005
PONTIAC GRAND PRIX
1999 Pontiac Grand Prix Trouble Code P0420
Hi. Well My Question Is The Code P0420, What Would Cause This Code To Show Up. I Have Went Through And Checked For Vaccum Leaks And...
Asked by
NKane
·
3 ANSWERS
1999
PONTIAC GRAND PRIX
GUIDE
Check Engine Light Safe to Drive?
We are a team of ASE certified mechanics that have created this guide to help you understand if your car is safe to drive with the check engine or service engine soon...
2004 Pontiac Grand Am Code P0420
Good Afternoon, My 2004 Grand Am Has A P0420 Code. I Replaced The O2 Sensor That Is In The Exhaust Manifold. The Dealership Told Me That...
Asked by
forkliftbobby
·
1 ANSWER
2004
PONTIAC GRAND AM
Code Information
I Have A 98 Pontiac Thansport, It Has A P0420 Code I Cant Figure Out What I Would Look For In The #1 Bank Doug
Asked by
pitax1
·
3 ANSWERS
PONTIAC OTHER
Ask a new Pontiac question
Sponsored links
Ask a Car Question. It's Free!
SPONSORED LINKS
Online car repair manuals
