Engine Error
P0401
Exhaust Gas Recirculation (EGR) Flow Insufficient
Severity
Medium
Symptoms
Engine pinging or knocking, reduced fuel economy, rough idle
Common Causes
- Clogged EGR passages
- Faulty EGR valve
- Broken vacuum line to EGR
- EGR temperature sensor failure
How to Fix
- 1 Clean EGR valve and ports
- 2 Replace EGR valve
- 3 Check vacuum lines
- 4 Replace EGR solenoid
Estimated Repair Cost
USD
$150
–
$450
EGR cleaning: $150; EGR Valve replacement: $250 - $450