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My daughters 98 Legacy Outback throws the PO400 code, EGR issues. We exchanged the EGR valve for the one out of my 99 Lecacy Outback and hers still throws the code and mine doesn't. What else could it be? The cat plugging up/ How do you diagnose it from here? Thank you! Jeffro
 

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01 VDC, 05 R Sedan, 06 BAJA EJ257
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You need to check the EGR solenoid and Back Pressure Transducer. There may also be carbon built up preventing EGR flow. I've attached a Flow Chart that would apply.
 

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