P CODES (POWERTRAIN) P0400 - P0499 P0420 Questions
2000 Mitsubishi Galant CODE P0420/P0420
This Code Is The Only One That Keeps Appearing Pending Twice In My Car, Now It Makes A Loud Funny Vibration Noise When You First Press The...
Asked by MYSWEETX5
2002 Chevy Impala P0420
Computer Problem
2002 Chevy Impala 6 Cyl Wheel Drive Type Unknown Automatic 97809 Miles
What Can I Do To Fix This?
Catalyst...
Asked by daniuskarojas
2003 Buick Century Code P0420
What Does It Mean , Catalyst System Below Threshold (bank 1). Catalytic Converter Plugged?
Asked by bikewrek
1998 Chevy Cavalier P0420 Code
I Am Receiveing A P420 Code Bank 1 And Have Replaced The Entire Exhaust System Including The Exhaust Pipe, Cat Converter, O2 Sensors Both...
Asked by bstash143
2006 Subaru Impreza OBD-II Code P0420
I Am Showing This Code, And Have Noticed That, When The Car Is First Turned On And Shifting From Reverse To Drive (automatic), It Bucks. It...
Asked by johnnyinterwebs
P0420
Gave Car Tune Up And Found Vacuum Leak,engine Light Still Comes On,code 420,430
Asked by mollie bennett
1999 Chevy Tahoe Diagnostic Code P0420
My Servie Engine Light Is On My Friend Looked Up The Code And It Said ....catalyst System Efficiecy Below Threshold [bank 1] What Does This...
Asked by Mike Michon
P0420 Catalyst Efficiency Below Threshold(bank 1)
I Have A 2000 Honda Odyssey Ex 124000 Miles With Automatic Transmission. I Am Assuming My Problem Is With O2 Sensor On Bank 1, My Question...
Asked by juarezleo
Code P0420
97 Acura Cl 2.2 120k Miles The Code Indiacates Catalyst System Efficiency Below Threshold Bank (1) Any Idea On How To Correct
Asked by fburks