P0401
EGR A Flow Insufficient Detected
P0401 is an OBD-II diagnostic trouble code meaning: EGR A Flow Insufficient Detected. Common causes: egr valve clogged, egr solenoid malfunction. Estimated repair cost: $56–167.
Symptoms
- Unstable engine idling
- Reduced engine power
- Increased fuel consumption
- Detonation (knocking) in the engine
Causes
- EGR valve clogged
- EGR solenoid malfunction
- Damage to vacuum lines
- EGR valve position sensor malfunction
- ECU software error
How to Fix
- Check the condition of the EGR valve and clean or replace if necessary
- Check the operation of the EGR solenoid
- Inspect vacuum lines for damage
- Check EGR valve position sensor
- Reset the error and check the system operation
Related codes
Error P0401 by Vehicle Brand
FAQ
What does the P0401 code mean?
P0401 is an OBD-II diagnostic trouble code that indicates: EGR A Flow Insufficient Detected
What causes a P0401 error code?
The most common causes of P0401 include: EGR valve clogged; EGR solenoid malfunction; Damage to vacuum lines; EGR valve position sensor malfunction.
How do I fix a P0401 diagnostic trouble code?
To fix P0401: Check the condition of the EGR valve and clean or replace if necessary. Check the operation of the EGR solenoid. Inspect vacuum lines for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0401?
Limited driving only, diagnose soon
How much does it cost to fix P0401?
The estimated repair cost for P0401 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat