EGR Control Solenoid Valve
WARNING: This page is about a different car, the 2004 Acura 3.5RL, 2003 Acura 3.5RL, 2003 Acura 3.2TL, and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
See Figure for component location (3.5RL). For diagnostic procedures, see DTC P1491: INSUFFICIENT EGR VALVE LIFT DETECTED under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.