P0400Exhaust Gas Recirculation (EGR) Flow Malfunction
The exhaust gas recirculation (EGR) system has a general problem.
Can I keep driving? Yes
You can keep driving normally. Schedule a check soon so emissions and performance are not affected.
Sistema Afectado
Sistema de Escape · Catalizador y sensores O₂
La falla se localiza en la línea de escape: catalizador, sondas lambda (O₂) o sistema EGR.
Espacio para vendedores de repuestos
Aún no hay un anunciante en este espacio.
Symptoms You Will Notice
What you may observe when this code appears
- Check Engine light
- Engine knock
- High emissions
Possible Causes
The components or conditions that trigger this code
- 1Clogged EGR valve
- 2Faulty solenoid
- 3EGR sensor failure
How to Fix It — Step by Step
Recommended diagnostic and repair procedure
- 1Clean the EGR valve
- 2Check the solenoid
- 3Check the EGR sensor
Note: This information is for general reference. For precise diagnostics and safety repairs, always consult a certified mechanic.
Estimated Cost
Approximate range in USD (varies by region and shop)
Varies by diagnosis
* Diagnosis only: $50–$150
Quick Info
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