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P0404

Overview

Code

P0404

Code Type

P

Code Class

P0

System

Engine, Emissions

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0404 indicates an EGR position sensor range or performance problem

Symptoms

Check Engine Light illuminated; Poor fuel economy; Engine hesitation

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

EGR valve position monitoring and emissions control

Possible Causes

Faulty EGR valve position sensor; Carbon buildup; EGR valve sticking

Diagnostic Steps

1 Monitor EGR position data via scan tool; 2 Inspect EGR valve for carbon buildup; 3 Clean or replace EGR valve; 4 Test sensor wiring

Drive Safety Notes

Driving is safe but emissions may increase

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