DTC P0400 Exhaust Gas RECIRCULATION Flow: Trouble Symptom

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Movement performance problem when engine is low speed.
Improper idling
Movement performance problem

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode < refer to OPERATION , Clear Memory Mode. >, and Inspection Mode < refer to PROCEDURE , Inspection Mode. >.

DIAGNOSIS PROCEDURE

Step	Check	Yes	No
1 CHECK CURRENT DATA. Start the engine. Read data of intake manifold absolute pressure signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedures, refer to "READ CURRENT DATA FOR ENGINE". < refer to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedures, refer to the general scan tool operation manual.	Is the measured value 53.3 kPa (400 mmHg, 15.75 inHg) or more?	Make sure that the EGR control valve, manifold absolute pressure sensor and throttle body are installed securely.	Go to step 2 .
2 CHECK EGR CONTROL VALVE. Remove the EGR control valve.	Are there any holes, clogged lines or foreign matters in the EGR system?	Repair the EGR system.	Replace EGR control valve. < refer to EGR CONTROL VALVE . >