P0402 – EGR Flow Excessive
Want to confirm the real cause of this fault code?
A high‑quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze‑frame information — exactly what you need to verify the root cause of this code with confidence.
Symptoms
- Rough idle
- Hesitation
- Poor acceleration
- Stalling
- Check engine light
Causes
- Stuck EGR valve
- Faulty DPFE sensor
- Vacuum leak
- Carbon buildup
- ECU issue
Diagnosis
- Inspect EGR valve
- Test DPFE sensor
- Check vacuum lines
- Inspect passages
- Scan live data
Repair
- Replace EGR valve
- Replace DPFE sensor
- Fix vacuum leaks
- Clean passages
- Update ECU