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CHECK ENGINE, due to sticking EGR

Symptom: The CHECK ENGINE lamp lights. DTC P0400 and possibly P0244 are generated due to the EGR valve sticking. The customer notices a significant difference in driveability. Once the engine has cooled slightly, the lamp goes out.

CHECK ENGINE, due to sticking EGR

Fault symptoms

The CHECK ENGINE lamp lights. DTC P0400 and possibly P0244 are generated due to the EGR valve sticking. The customer notices a significant difference in driveability. Once the engine has cooled slightly, the lamp goes out.

Conditions

The valve can stick under certain driving conditions, such as driving a long distance at normal speed when the coolant hoses to the EGR valve blocked.

Cars affected

9-3 with diesel engine M 01 and VIN 12020001 - 12055516

Procedure

Check that the coolant hoses to the EGR valve are not blocked following the method below.

Note

If the coolant hoses are not blocked, carry out the normal fault diagnosis for the above DTCs.



1. Undo then close the coolant expansion tank cap to release any pressure in the cooling system.


2. Remove the upper engine cover

3. Clamp the lower hose with pinch-off pliers close to the end.


4. Have some absorbent paper or similar at hand to soak up any coolant that escapes. Disconnect the lower hose from the EGR-valve.


5. Squeeze the upper coolant hose and check whether coolant comes out of the EGR valve pipe. A lack of coolant indicates that the hose is blocked and must therefore be changed.

6. Remove the pinch-off pliers from the lower coolant hose. Place the pinch-off pliers on the upper coolant hose to the EGR valve.


7. Squeeze the upper coolant hose and check that coolant runs out of the lower coolant hose on the EGR valve. A lack of coolant indicates that the hose is blocked and must therefore be changed.


8. Connect the coolant hose to the EGR valve and remove the pinch-off pliers.

9. Check the coolant level, start the engine and ensure there are no leaks.

10. Fit the upper engine cover

11. Delete the DTCs, road test the car and check that no DTCs are generated.