Powertrain
generic / SAE
P0404
EGR Range/Performance
The EGR valve does not move through its expected range or its position feedback does not track command. The valve may be sticking, the position sensor may be drifting or carbon buildup is preventing full travel.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 04
Possible causes
- Carbon buildup on EGR valve high
- Position sensor drift medium
- Mechanical valve damage low
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–800 €
- Estimated time: 0.5–3 h
- Component: egr valve
- Component: egr position sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012