P CODES (POWERTRAIN) P0400 - P0499

How Do You Repair The Above Error Code And Find Out Possible Causes And Their Locations. Please Advise. Thank You.

My Car Is Running Fine However Grey Smokey Fumes Are Coming Out Of My Exhaust. What Steps Do I Need To Take To Repair It?

We Have The Above Code Showing In Our System. I Am Trying To Locate The Exact Root Of The Problem. Fuse? Air Check Valve? Please Help

Main Cat Is Below Eff. Threshold (bank 1) Does This Mean I Have To Replace The Cat That Comes Off The Exhaust Header Or The One In...

How Do I Fix This Check-engine Light Diagnosis?

2002 Hyundai Elantra 4 Cyl This Code Relates To The Evap System. Which Is The Best Way To Determine If The Purge Valve Is The Cause...

Where Can A Find The Vent Control Valve Circuit?

1997 Lexus Es 300 6 Cyl Automatic 126000 Miles I Believe This Is A Co2 Sensor Malfunction. Is This Something That Can Be Replaced At...

Hey Guys! I Just Purchased A 2008 Mitsubishi Eclipse For 17,000. The Minute I Drove It Off The Lot, The Check Engine Light Came On, When I...

The Above Code Was Obtained From The Diagnostic Please Advise The Next Action