netscape

Hi I wonder if anyone has this problem: I have a 2004 Sentra 2.5L sedan. Within the last two years my "service engine soon" light had come on several times. The first time, I took it back to the dealer and they replaced something (can't remember what the part was called exactly). The second time, I took it to a different dealer. They didn't find anything wrong, and the light was turned off after their inspection. Today, the light came on again. I'm planning to take it back to the dealer again, but it's getting annoying. Any other Sentra owner having the same issue? I'm tempted to just ignore it but according to the manual it sounds like it could be a sign of a serious problem.

Thanks,
Rob