P0401Engine
EGR Flow Insufficient Detected
Warning - Service Soon
What This Code Means
The EGR (Exhaust Gas Recirculation) system flow is below the expected level.
Symptoms
- Rough idle
- Increased NOx emissions
- Check engine light
- Slight power loss
Possible Causes
- Clogged EGR valve
- Carbon buildup in EGR passages
- Faulty EGR position sensor
- Vacuum leak
- Clogged EGR cooler
Recommended Solutions
- 1Clean or replace EGR valve
- 2Clean intake manifold passages
- 3Replace EGR position sensor
- 4Check vacuum lines
- 5Clean or replace EGR cooler
Quick Info
- Code:
- P0401
- Severity:
- warning
- System:
- Engine
Related Procedures