DTC code
P0402
Exhaust Gas Recirculation Flow Excessive
Technical guide
Symptoms
- Rough idle
- check engine light
- failed emissions
Probable causes
- EGR flow excessive
- EGR valve stuck open
- DPFE sensor fault reading too high flow
Diagnostic steps
- Check EGR valve for stuck open.
- Test DPFE sensor.
- Replace EGR valve if stuck.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on P0402
Nothing confirmed yet for this code. No guess is offered on purpose.
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