P CODES (POWERTRAIN) P0400 - P0499 P0401 Questions

I Have Already Replaced The Egr Valve And The Dpfe Sensor, But Still Can't Keep The Check Eng Light Off. Code P0401 Insufficientegr Flow...

Hello There. I'm Trying To Diagnose A P0401. I Had A P0405 Previously But Confirmed A Bad Egr Valve That Was Reading A Sporadic .05...

P0401 Code Continues To Show Up, Even After Replacing The Egr. Oddly Enough The Code Doesn't Show Up For A While If Mid-grade Gas Is...

A Month Ago I Had Check Engine Light With A P0401 Code For Bad Egr Flow. After Checking This Site I Figured It Had To Be The Vsv Which I...

My Check Engine Light Came On, This Is The Code That I Found With My Obd Scanner: P0401 Exhaust Gas Re-circulation Flow Insufficient. So...

My Engine Light Is On And I Can't Get It Smogged. All The Tests Passed With The Exception Of The Light. I've Cleaned Out The Egr...

My Car Is Giving A P0401 Code. I've Replaced The Following Parts. Egr Valve Pcv Valve As A Kit Map Sensor Mass Airflow Sensor All...

Exhaust Gas Re-circulation Problem.

What Can I Do To Fix This. I Have Replaced Hoses And The Filter In The Egr. Keep It Simple And If There Are Any Pictures So I Can Identify...

P0401 Code Keeps Triggering When I Have Already Fixed/changed The O2 Sensors, Mass Flow Sensor, Egr Regulator/modulator, Evap Canister, And...