LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Buick
>>
2004
>>
Century Base
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Controls (DTC P0140 To P0496)
>>
Engine Controls Diagnosis
>>
DTC P0404
>>
Conditions for Setting the DTC
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Conditions for Setting the DTC
The difference between the EGR Position Sensor parameter and the Desired EGR Position parameter is more than 15 percent.
The above condition is met for more than 20 seconds