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DAF fault code P0402: likely components, OEM numbers and symptoms.

EGR flow too high / excessive. This page groups every component report connected with P0402, so a mechanic can move from the error code to the relevant OEM numbers, defect symptoms and fitment checks.

A fault code alone is not a parts order. Confirm with live data, VIN, installed OEM number, connector and part photos before quoting or fitting.

Component families linked with P0402.

The same code can appear with different root causes. Use the OEM number and symptom pattern to choose the right branch.

Symptoms reported with P0402

Power derate or limp mode
EGR valve stuck open or stuck closed in diagnostic software
Rough idle, hunting or surging at cruise
Black smoke when pulling away or backing under a trailer
Failed regeneration and high DPF differential pressure
Coolant loss with no visible external leak
AdBlue or NOx after-cat secondary faults from incorrect EGR rate
Rough idle or stalling at low speed
Power loss and black smoke
Engine warning lamp for EGR flow
Increased fuel consumption
Failed emissions test or high NOx reading

Likely root causes behind P0402

  • Carbon and soot cake the EGR valve plate, shaft and valve seat.
  • Condensation and oil mist form acidic sludge after the EGR cooler.
  • Motor gearbox wears from continuous modulation and high resistance.
  • Coolant leakage through the cooler or valve interface corrodes electronics and accelerates sludge build-up.
  • Position sensor drift causes commanded-versus-actual mismatch.
  • Excessive soot build-up blocks EGR flow.
  • Actuator motor burns out after high resistance at the valve shaft.
  • Valve sticks open or closed after long-mileage exhaust contamination.

Trucks and engines that report P0402

Model Engine Years
XF 106 MX-13 Euro 6 12.9L 2013-2023
CF 85 MX-13 Euro 6 2013-2021
CF 430 MX-13 Euro 6 2017-2023
CF 480 MX-13 Euro 6 2017-2023
CF 530 MX-13 Euro 6 2017-2023
XG MX-13 Euro 6 2021-2023
DAF XF / CF Earlier EGR-equipped engines 2001-2013

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