Section 43 (Engine Controls - Self-Diagnostics - 3.0L): Summary
WARNING: This page is about a different car, the 2003 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.
If driveability symptoms exist or intermittent codes exist, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.