I have a 1996 Regal with the 3100 V6 that has a check engine light. The code is P0401. I have replaced the EGR with a working one from a low mileage car. The light is still on. What should I check next? How can I be sure the new EGR works or my old one is bad? From what I can see on this engine the only parts of the EGR system is the valve itself and the pipe that goes from the intake to the exhaust manifold.
My next step is to soak the bottom of the EGR valve in carb cleaner and spray it down that tube as well.