P CODES (POWERTRAIN) P0400 - P0499

I Removed The Cat Converter, But There Seems To Me No Damage Visible. Please Advise

I Just Recently Gotten The Code P0400 Yesterday But I Also Had The Code P0171 For Like A Week, I Have Been Searching Up Ways To Fix This...

I Clean The Egr Valve For My Ford Expedition 3 Times And I Still Get The Code P0402 Intermittently. What Can I Do To Solve The Problem?...

I Have The P0402 Code. I Understand It's An Egr System Problem. I Tested The Egr Valve, Using Vacuum To The Valve And The Engine Dies....

When The Car Is First Started After Sitting Overnight, The Idle Is Rough With A "chug" To The Engine. If I Do Not Wait Until The Idle...

Hi. Keep Getting A P0402 Code Even After Changing Egr Valve And All Sensors Regarding Egr Valve Including 02 Sensors(4) And Replacing Gas...

Hello. New To Site And Looks Great. Recently Purchased A 1996 Cutlass Supreme 3100 (3.1) V6 With 131000 Miles. Service Engine Soon Light...

I Scanned My Car Recently When I Had Check Engine And Vsc Lights On. I Got P0420 And P0446 Codes With Code Descriptions Catalyst System...

The Car, After Sitting For A Few Hours Will Start And Idle For About Ten Minutes Before It The Rpms Start Going Wild, It Then Drops To...

The Car Turns Over But Won't Crank. We Put A Ogd Reader On It And Got The Code P0455 And So We Replaced The Gas Cap And Now We Are Cleaning...