I've got a 1998 Saturn SW1 with about 150k on it. I'm having problems with a EGR related check engine light. Its throwing both P0405 and P1404 codes.I tried cleaning out the original EGR valve, then replaced it with a new Delphi unit, and cleaned the connection. It is still throwing the same codes. Any ideas? Just thought I should mention that this is one Saturn that DOESN'T use oil..