Engine Error
P0402
Exhaust Gas Recirculation Flow Excessive Detected
Severity
Medium
Symptoms
Engine stalling at idle, rough idle, poor drivability
Common Causes
- EGR valve stuck open
- Faulty DPFE sensor (Ford specific)
- EGR vacuum solenoid shorted open
- Carbon buildup keeping valve open
How to Fix
- 1 Clean carbon from EGR valve seat
- 2 Replace stuck EGR valve
- 3 Replace DPFE sensor
- 4 Test vacuum solenoid
Estimated Repair Cost
USD
$80
–
$400
DPFE Sensor: $80 - $150; EGR Valve: $200 - $400