Engine Error
P0400
Exhaust Gas Recirculation Flow Malfunction
Severity
Medium
Symptoms
Engine pinging on acceleration, check engine light, failed emissions
Common Causes
- Clogged EGR valve or passages
- Faulty EGR vacuum solenoid
- Broken vacuum line
- Defective EGR position sensor
How to Fix
- 1 Remove and clean EGR valve and intake ports
- 2 Replace EGR solenoid
- 3 Inspect and replace vacuum lines
- 4 Test and replace EGR valve assembly
Estimated Repair Cost
USD
$50
–
$350
Cleaning: $50 - $100; EGR Valve replacement: $150 - $350