I am new to this site. I have a 1996 S500 coupe with 92,000 mi. the P0410 code has made the Engine light to come on. the pump , all valves and lines been checked and are fine and working, but i clear the code and it comes back after 40 mi. of driving. Fuses are fine. I need help to get this corrected to get my inspection done. Any ideas?