P CODES (POWERTRAIN) P0400 - P0499

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...

Engine Light Came On. This Is The Code That Came Up. Two Days Later The Light Went Off On Its Own. I Made An Appointment To Have The Part...

I Am Still Receiving A P420 Code After Replacing The Entire Exhaust System Including The Exhaust Pipe, Cat Converter, O2 Sensors Before...

Rough Idle/idle Stall. Stalls When Parked. Coolant Is Low. Coolant Was Flushed And Replaced Less Than A Week Ago And It's...

Took Car To Autozone And Got This Code, Definition Is Catalyst Efficiency Low Bank 1. What Does It Mean And How Can I Fix It To Pass...