1997 Subaru Legacy with engine code P0400

Question

what ells do i chech the car runs fine im told test drove it seems fine but the mill comes back
after 200 miles or so code i be mising the 4 winding mote and just think it of iv randr the egr valv

Answer 1

P0400 Exhaust gas recirculation (EGR) malfunction

Here are what can cause the EGR to malfunction 1, The EGR solenoid 2. The vacuum hose to the EGR being damage or not sealing properly, 3. A partial resitriction in the EGR passage.4. The EGR valve itself. With all these probable causes if the MIL light comes on after 200 miles, The most likely is the EGR solenoid failing

Answer 2

P0400 Subaru Code - Exhaust Gas Recirculation Flow
Read more: https://www.autocodes.com/p0400_subaru.html