OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P0404?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCarbon buildup on EGR valve
- PossiblePosition sensor drift
- Less likelyMechanical valve damage
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Valve, Egr Position Sensor
Related codes
- P0400Exhaust Gas Recirculation Flow Malfunction
- P0401Exhaust Gas Recirculation Flow Insufficient Detected
- P0402Exhaust Gas Recirculation Flow Excessive Detected
- P0403EGR Control Circuit
- P0405Exhaust Gas Recirculation Sensor "A" Circuit Low
- P0406Exhaust Gas Recirculation Sensor "A" Circuit High
- P0407EGR Sensor B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.