P0402: Exhaust Gas Recirculation Flow Excessive Detected
System: EGR / emissions · Priority: medium
What P0402 means
The control module detected a condition matching the generic definition Exhaust Gas Recirculation Flow Excessive Detected. A trouble code identifies what the module detected; it does not automatically identify the failed part.
Useful next checks
- Check whether the EGR valve is stuck open.
- Review position/flow sensor data.
- Inspect vacuum control or electronic actuator behavior depending on the system.
Why vehicle context matters
The same generic code can have different diagnostic paths depending on engine, calibration, wiring layout, service bulletins and related codes. Freeze-frame and live data can help establish when the fault occurred.
Need a scanner for P0402?
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