Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 159 Factory Service Manual (2005-2011)23 · Fault diagnosis
23 · Diagnostics

P0402 - EGR valve

Make
Alfa Romeo
Model
159 Factory Service Manual
Year
2005–2011
Section
Examiner - diesel electronic management › P0402 - EGR valve
Fault diagnosisP0402 - EGR valve

P0402 - EGR VALVE

1.9 JTD 8V, 1.9 JTD 16V, 2.4 JTD 20V

The diagnostic equipment signals: Error P0402 (EGR valve).

This error is detected if the quantity of exhaust gas recirculation is too high.

As a result, the exhaust gas recirculation valve is switched off and the supercharging pressure can longer be controlled and the quantity of fuel injected is reduced.

0Preliminary checksALL OKPROBLEMS ENCOUNTEREDACTION

Check the seal of the inlet/supercharging system hoses.

Check the hoses and pipes connected to identify any obstructions, damage etc.

Check that the pipe restriction bands in the air intake/inlet system are correctly fitted.

Move on to Step 1Connections faulty, obstructions or porousnessRenew or, if necessary, replace the faulty components
1Check using diagnostic equipmentALL OKPROBLEMS ENCOUNTEREDACTION

Select the following system on the diagnostic equipment: Diesel EDC16C39 electronic injection system and check the following parameters:

  • Air temperature in the intake manifold

See Test 1064BD SUPERCHARGING TEMPERATURE CHECK

  • Supercharging pressure Objective
  • Supercharging pressure Measured

See Test 1060GF SUPERCHARGING PRESSURE CHECK

  • Measured air mass

See Test 1060GG MEASURED AIR MASS CHECK

End of diagnosis

Parts & tools for this job For 2005 Alfa Romeo 159

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.