P CODES (POWERTRAIN) P0400 - P0499

I Have Been Driving With The 440 Code (exaust Leak) For Several Months W/ No Problem. Today Car Started Missing When I Tried To Exelerate...

Computer Problem 2000 Chevy Silverado V8 Two Wheel Drive Automatic 200k Miles Evap Control System Small Leak Code. Replaced Fuel Cap...

I Have 1999 Cutlass Oldsmobile A 3.1 Engine, My Question My Check Engine Light Is On And Is Showing A Code Of P0442 How Do You Find And...

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....

Gave Car Tune Up And Found Vacuum Leak, Engine Light Still Comes On, Code 420,430

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...

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...

Car Seems To Idle A Little Rough. Wont Pass Smog. Im Not Sure If Its Just The Egr Valve Not Opening All The Way? Please Help. Thank You.

97 Acura Cl 2.2 120k Miles The Code Indiacates Catalyst System Efficiency Below Threshold Bank (1) Any Idea On How To Correct

Egr Insuficient Fllow.I Did What You Told Me To Clean The Port At The Intake Manifold.I Use A Wire Cable. About 12 Inches Long With Brake...