P0402

Professional fix for fault code P0402

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Software fix

EGR OFF + DTC OFF

Affected system:
EGR / Exhaust Gas Recirculation

What does code P0402 mean?

EGR flow excessive. The ECU detects recirculated gas is greater than expected.

Symptoms seen in the workshop

  • Rough idle
  • Black smoke
  • Power loss

Common causes of code P0402

  • EGR valve stuck open
  • Carbon deposits preventing full closure
  • Faulty actuator

Fix by ECU remapping

EGR system deactivation in calibration and diagnostics.

⚠️ Important: Disabling the DTC without the correct calibration of the related system (EGR OFF + DTC OFF) is not a valid fix. Both the calibration maps and the diagnostic mask have to be modified.

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Modifications to emission control systems (EGR, DPF, AdBlue, catalyst…) are offered exclusively for competition use, off-road use or in markets where regulations allow it. The professional workshop installing the file is responsible for complying with applicable law.