EGR Flow Excessive
The EGR system is flowing too much exhaust gas.
Informational only. Consult a qualified mechanic.
- EGR valve stuck open
- Faulty DPFE sensor
- Vacuum leak to EGR
Replace EGR valve or DPFE sensor.
What does P0402 mean?
The P0402 OBD-II diagnostic trouble code (DTC) indicates: egr flow excessive. This is a medium-severity powertrain code that your vehicle's onboard diagnostics system triggers when the egr system is flowing too much exhaust gas. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
Use Your Service Book to log this diagnostic trouble code to your vehicle's service history, track repairs, and get maintenance reminders — all for free.
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