The EGR system is flowing too much exhaust gas.
Informational only. Consult a qualified mechanic.
Replace EGR valve or DPFE sensor.
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.
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